But if you're not a dumb user
The reverse of this is when an experienced user (me) has a very detailed explanation of a problem, and screen sharing is not always a good idea.
Me: Can you check the host entry for "myexistinghost" in the DNS map as it seems to have been removed, it was working yesterday.
Support: Can you share the screen with me?
Me: I could but it would be a bit pointless as you can try contacting "myexistinghost" from your own, or any other machine, that is pointing at that misconfigured nameserver.
Support: Can you share the screen with me?
Me: Sigh, OK. Here, watch me type "nslookup myexistinghost".
Support: Oh I see you are not using Windows therefore we cannot support you.
Me: It isn't a Windows, or any other client OS issue. It is a networking issue with a misconfigured nameserver. Nothing to do with the operating system I am using.
Support: Thank you, goodbye.
Biting the hand that feeds IT
