William Jennings Bryan, for one, would’ve been horrified.
He certainly would, though I don't know that Bryan counts as a "socialist."
I was thinking more along the lines of actual Marxists from the nineteenth century. Yes, they were anti-religion, but they did not exalt sexual deviancy over the working class.
The devoutly Christian Bryan would be mortified by Bruce Jenner using the girl’s room.
But on economic issues? He was a typical rich socialist idiot, feel the Bern.