Sexism, sexual assault, racism
Also, I think there is a very similar issue with racism. I am very white passing though, so I don't think I'll be able to bring much to the table regarding this topic, there are much better people to listen to than me. I just hope people realise how opression isn't just small statistical differences in life quality, it's a constant stream of abuse and dehumanisation.
Sunbeam City is a Libertarian Socialist solarpunk instance. It is ran democratically by a cooperative of like-minded individuals.