Don’t worry. As a little experiment, I’ve found time and time again across a whole range of social media sites over years, that having a username that some people could perceive as aggressive will get you blocked / banned faster than you would believe. The people of Lemmy are not as different/open as they think they are!

You get banned for having the username "catty"? Seriously?

Unfortunately, when I open groups, I get called out that it should be merged with a sort-of-similar group, and then of course, empty groups are hard to start.

I mean is that a bad thing that groups get merged? Lemmy ain't reddit, and if you wanna follow niche (or even not-so-niche) hobbies here, it's usually better to have one group with 10 people in it rather than 5 groups with 2 people in it. If you wanna hang around in your 2-person group, no one's gonna ban you for doing so.

Having to take the effort to block all the politics in the first place mean 90% of people won’t do it and will get tied up with giving their asshole to each post rather than perhaps what they wanted to come here for in the first place. I believe that doesn’t create an overall diverse community.

If you joined an instance where 90% of the default communities offend you, maybe you should consider joining another instance?

Sentiment analysis is an old and established form of ai that would be useful here.

You'd use sentiment analysis how, exactly?