Mastodon does have a history of being Queer friendly (one app even asked me if I wanted to join an instance which was for Furries) but that gets used as a shield when people point out how unfriendly these spaces are to lots of other people. Heck, I saw parts of Black Twitter return to Twitter and say they would rather deal with the Nazis where they had community than stick around on Mastodon. It also does have decentralized moderation which makes it easier to ban Nazis.