Well if someone is stupid and my bullying gets them a bit out of their stupidity I don't think it's too bad. Also this is largely not a problem where I live, my mom asked if we could use signal because she disliked WhatsApp because of privacy, and I just installed signal, my dad still uses WhatsApp, my friends and I use telegram and discord. I've actually never had to do any real bullying because in the real world everyone understands the issue enough for us to get somewhere sensible.
It's neither rude nor pointless to explain software to users who are less adept with software, sometimes it won't work but, it also sometimes does just work, especially with chat apps, it's literally just replacing an icon, because on the UI side they are very similar. And I hate to tell you this but not providing tech support if you are good at it also just doesn't help, it just makes us collectively stupider. Sure don't burn yourself out on users who can get nothing right, but like teach your parents colleagues and friends some fundamentals that you seem to understand, if only because it makes your life easier.