You'll Get The Respect You Deserve
The problem with the issues covered in articles like this is that they always come from someone who has already been run over. Yes, there are some real asses out there, but bitching about that is like bitching about the position of Sol relative to Uranus: Completely pointless.
If you're not getting the respect you believe you deserve then that needs to be dealt with internally, inside your head, using whatever mechanisms you use to define yourself. The question that needs answering is how people knew they could run over you. You get that answered and the rest sorts itself out automatically.
If you don't think you're broadcasting weakness, but you're still getting run over, then your concept of strength is faulty. That's got fuck all to do with ones reproductive system, that fact is the same in all Humans. It's easy to see the poor attempts people make to increase their own valuations of themselves. Guys tend to do it with attitude, booze and flash, womenfolk tend to do it with bitchy attitudes and sluttiness. But those things amount to a person plotting to fool themselves without being noticed by themselves, and if that works then the problem is far, far deeper than self respect issues.
Make no mistake about it, this is 100% an issue of self respect, or lack thereof. Lack of self respect is a tangible thing and people are drawn to it. It's Human nature to assert oneself over the weaker Humans and everybody does it. There are no exceptions. So why are you coming off as the weak person? It sure as fuck isn't any of your lady parts, because at the table right next to you some guy is getting run over because he is being perceived as weak. Women tend to put too much emphasis on the value of their fun bits, and it blinds them to the truth of the matter. That truth being you are presenting yourself as the easiest to dominate.
What's worse, is that a conference/tradeshow in any industry is packed to overflowing with people highly adept at recognizing weakness and pouncing on it. You've got public facing operations people, you've got Salesdroids and marketing types as well as professional management at nearly all levels and their livelihoods depend on knowing how to identify their targets and knowing how to get to them before they've even spoken. Those people aren't trained social anthropologists, those people are natural born predators. They can't help it, but you can stop them. Hell, you'll know you're doing it right because they won't even start. They'll know, innately, to look for easier prey.
I can't give you instructions on how to do it, but commanding respect (not demanding it) is something that comes from inside you. It is just as palatable as weakness and requires no show of strength or display of power (well, maybe a few displays, early on, but word spreads quickly among the weak).
I'll finish with this. You can't, really, control the behavior of others. You can manage it, to some degree, but truly control it? Never. You can control your behavior though, so start there and start by respecting yourself. Which you clearly don't. Plenty of others aren't going to respect you either, and why should they if you don't respect yourself.
That's a general truism, and doubly so as a professional. As a professional one of the easiest was to work people is to identify the weak one and feign respect so as to manipulate them into whatever it is you need them to do. That's not being cynical, that's being still mostly sane after playing this game, successfully, for quite some time. Bullshit self respect tactics always fail, and the fallout is always worse, and more embarrassing, that it has to be. Be you. Be proud of who you are and unwavering in your belief in yourself. That's the only way you're going to get what you want out of your career, and your life in general.
Ending here, promise. You seem to be making the same mistake as so very many others with your idea of what constitutes professional behavior. Here's a hard won nugget for you to stick in your shoes (so as not to forget it). The further you go in your career the more important a robust, and true, level of self respect becomes. That corner office is a bastion of bent ethics and broken moral compasses. You will be absolutely destroyed, to the very core of your soul and being, by the people who work in those offices if you don't believe in yourself absolutely and unwaveringly. It won't be anything personal, but the entirety of getting that corner office and obscene salary is based on your success rate in battles of will disguised as respect with some platitudes on top and the first one to blink loses. I used to take everything from the loser, but I've mellowed. Some won't though, and tits or no tits, they will put your severed head on a pike by the gate as a warning.
Practice with the drunk asshats at the conferences and you'll know you're heading in the right direction when you can yuck it up with the drunken Proles, but nary a single one would even consider uttering an untoward comment, much less lay a hand on you. Wordlessly commanding respect from drunken predators through projection of sheer, indomitable will is a good entry level test for those who have lofty professional goals. Junior Executives and Clients come after that. It's a long road ahead of you, you don't believe in yourself, but you should, even though it will be difficult. Work on it and get back to us after the VMware event a year from now.