To think that Navalny or his wife are in any way leftists is insane. They were leaning more towards nationalism (just for Russia instead of the US).
In the face of current events though, that can be overlooked as it is not a narrative that serves western interest.
But to give an anecdote about an alternative, I rarely see any bigotry on Mastodon. Instances which allow that or don't moderate it correctly get block listed by instances I like. These instances may defederate into their own bubble in which they can still exist but cause no harm to the general timeline. Yet everyone still remains the freedom to express themselves.
I like this because it's just a natural way of how to solve this problem for the end user.