The fediverse has a pretty large Queer community and a lot of the software the fediverse runs on was created by Queer people I think it’s important to understand that some people may not take kindly to someone defending a country that consistently persecutes LGBTQ+ people.
It really depends on the instance you decided to join, I am sure there is an instance for people that have similar beliefs to yourself so maybe that might be a better fit, I’ve never seen anyone say that Mastodon or the Fediverse is a free speech platform. Perhaps you should read the rules for the instance that you join before complaining about being banned for breaking them.