To be blunt: Yes, you're going crazy. We have been insisting that they be called blasters for a long time - before I made this account, and that was over a decade ago. It's only more obvious as of late because people have been poking the beehive and being adamant that they have the right to use "gun", regardless of how it affects the community. And because of recent events (see Meaker's link) being more relevant as the online community has grown.
Insulting people telling you "please stop doing that, you know better" is why you've been seeing the response you've been getting. You've said, across different communities, that:
1. It's okay to call them guns because they aren't actually blasters, no matter what the official terminology is.
2. Asking why the word gun is being restricted because "this isn't f***ing china"
3. Arguing with moderators after being told to stop. Across multiple communities with multiple mod teams.
Most people being told to say blaster instead of gun, they go "oh oops sorry", and that's the end of it. You're the one arguing with people and bringing up the topic with hostility, that's why you're being met in kind.
If I understand what you've been saying so far across a few platforms (reddit, discords): You understand that we should be using blaster instead of gun because the public gets upset, but don't like how we are forcing it in every context, even in private.
Here's an analogy: Racial slurs are not okay in public. You do not use them because they immediately tell people that you are an insensitive/prejudiced individual. Just because you're in private and the public can't hear you, that does not make it okay to use racial slurs. It just lets everyone in the community know that you're willing to use those words, and makes you look bad. Especially because you know the harm those words can do.