I have to say, I personally have been actively seeking male-only spaces for the past year. This has nothing to do with disliking women. I like women a lot and have a lot of female friends I care deeply about. The reason comes from my end - I have things that are difficult for me to talk about that I would like to discuss in a supportive environment with other people who understand and accept my lived experience. While I can and do open up to my female friends about some things, for other things I am simply more comfortable talking to other guys - where "more comfortable" means "I might talk about it *at all."

Unfortunately, most male-only spaces put up significant barriers to entry, because otherwise they become magnets for right wing lunatics or the chronically depressed.