I understand the irritation...
I'm a pedant - I'm annoyed that 'begging the question' has come to mean 'raising the question' so I now have to either say petitio principii or use some cumbersome phrase. I'm annoyed that politicians have changed the meaning of 'refute' to 'deny'. I'm annoyed that 'hacking' now seems to mean just the bad sort. I'm annoyed I can't say 'niggardly' even though its etymology is innocent. I could go on but I can almost hear you begging me not to.
However, we have to wonder why some people seem to be more offended by the move from master to main than non-white people actually were about the term master (if they were). I'm sure it can only be because people some kind of implicit criticism: the way that many people in my village are more worried that they might be considered a racist than they are about saying things that might be considered racist. But absolutely no criticism is implied. BLM aren't campaigning for these changes. They aren't campaignining for statue removal. They are campaigning for equality.
Look, I'm no expert - I'm almost a stereotypical gammon - middle aged, fat, bald, married with kids, cis-hetero white male. My best friend, who is of Jamaican decent, isn't offended by anything. He's supremely easy going - if he smoked joints he would be stereotypically Jamaican. But I very clearly remember, when I was 14 and he was 15 and we were looking at family trees, and I was laughing at his very non-Jamaican surname, when I realised that's because it's the name of the plantation owner who owned his male ancestors. That was a shock that I can't get over.
Perhaps its stupid to change master to main. But perhaps it shows we are at least thinking about these things, and maybe that is the most important thing we can do.