communism is often sold to the lgbt groups as being more accepting and the whole cavalcade of the slipperslope monsters (you know: peds, zoos and the like) is often more then willing to buy that commies would not murder them like they did historically. So when they go there they often find them selves around similar degenerates.
unlike fashisims well documented slaughter of gays tends to repel, because if they are killing off something that mild it's not hard to understand how they would teach child molesters.
tldr: Marxists advertised Marxism as being hyper accepting and got tons of predators who look for groups like that.
it's honestly a problem for the whole left, you got the lgbt stuff having zoophiles and pedos try to tag along and it makes them look bad as it looks exactly like what the right was talking about decades ago. Even if both of prior mentioned groups being hated by the lgbt as a whole