Well, I’m not going to comment on Russia’s imperialism being supported on Hexbear because I haven’t quite seen that as much as I’ve seen critique of Ukraine’s issue with Nazism and the West’s hypocritical denialism about that even existing as an issue in Ukraine—when during Euromaidan it was acknowledged. I don’t support Putin or the invasion, because while there are Nazis in Ukraine who should be dealt with the same could be said about Russia or the US itself, but I also don’t think the US is being smart by arming fascist Right-wingers. The US has done this before and it never works out well.
I don’t quite see the racism argument though. Hexbear is racist because some people support Russia? I mean, yeah, Russia can definitely be racist and maybe some people at Hexbear probably support Russia in an uncritical way. But lacking any racist memes or racist discussions happening, of which I’ve seen none, I don’t think that equates to the users or the instance being racist. The US and Europe are extremely racist societies, I would argue way more racist than Russia, but I don’t see people arguing that instances with liberals who support the US are racist instances and should be defederated.