You seem really obsessed about this, much more so than most people who might be in favor of supplying pronouns. I think that most people do it as a common courtesy. I generally don't, but it doesn't bother me if people do, and it doesn't hurt me in the slightest if someone asks me to supply my pronouns. My pronouns are "he/him". Not difficult at all.

That is just one of three reasons I listed. I'm not sure why you'd focus on that exclusively, it seems a bit silly to me.

What's being asked of you is a common courtesy. Anyone that refuses this courtesy that takes so little when specifically asked for it is taking actions that speak for themselves.

You're being asked something as simple as "how do you prefer to be addressed" and you've scoured the area for all the loose dust and detritus you can find to make yourself a mountain to die on. Is it really worth it? Perhaps there are other aspects to recent culture shift that are slightly less defensible that are better targets?