Not sure what you are hoping for here. Homosexuality has nothing to do with Socialism, which is why most socialists advocated killing gays, because they were evidence of late stage capitalism that couldn't be tolerated in a Communist utopia.

The only reason the Left tolerates it at all is because it's a useful "coalition of the margins".

If you want to whine about Weimar Germany tolerating it, you'll have to recognize that that's most likely the left-over institutional tolerance from the fact that there were a significant number of gays among Bismark's government. Again, the Fabian Socialists could have been using it as a coalition of the margins, but more than likely: gays were already in the established government. They were also in lots of other sectors. Like the SA.