Like I couldn't avoid being in clubs without fully dropping my hobbies. Martial arts is a good example of a generally pretty social space that's obviously very welcoming to men (I've recently been doing historical longsword fencing and there are a wide variety of weirdos successfully socializing in there) but I also do birdwatching with a group and volunteer at a wildlife rehabilitator and both of those are also pretty social.

That is exactly what the "male loneliness epidemic" is though, no? I don't know what definition you are using, but to me it's definitely the fact that we just don't have the time to go out and be social among other things, not that there aren't opportunities in the first place.