So what are your thoughts on gender exclusive spaces or activities?
For example, my son is in an elementary school that hosts a "girls on the run" club and one day after school last year he mentioned that he wished he could join. I told him I was sorry and offered that the school also had co-ed cross country and track and field that he could do instead. His response was that girls on the run is just for fun while the others are competitive and he doesn't want to be competitive. I told him I was sorry but not everything is open to everyone.
Similarly but also the opposite, as a male, at work I've gotten random invites to various lunch time events that range from career development to purely social that were clearly aimed at women but included the somewhat standard "all are welcome" wording. I've personally never believed the all are welcome wording, either inside or outside of work, is ever really honest and it is only included to avoid HR or legal complaints. So it comes across as "you're invited because we have to but you're not welcome" and thus I've never even thought about participating. I'll say I'm generally fine with not being welcome although I'd prefer they cull the email list rather than, effectively, be dishonest. As an aside, I'll add that if my wife wanted me to join her and participate in a public event advertised in a similar way it would turn into an argument since she would read the "all are welcome" while I would read the "Women's..." (or similar).
Personally I would prefer for children that either they not have gender exclusive things, at least for elementary public schools, or they provide an equivalent or similar offer for the other gender.
For adults, my opinion is more of a "do what you want" but I'd rather not be lied to. I also have a strong belief of "if I'm not wanted here I don't want to be here". Basically, don't invite me or state I'm welcome and then imply I'm not. And I get it that legal requirement may not allow that in certain contexts, but rather than saying "all are welcome" be honest and say something like, "we are legally obligated to state that this [thing] is open to all but we would prefer men not participate" and then own your decision rather than coat it in language for plausible deniability.
This question was triggered based on a post that has gotten to the main reddit page but I've been thinking about this issue since my son talked about it with me a year ago. I also realize that I'm only talking about things that are women exclusive since that's what I have direct personal experience with and I don't think I've ever personally seen anything advertised in a way to imply it would be for men or boys only and which didn't have a notional equivalent for women and girls; and in the case of my son's baseball and soccer leagues ( neither of which are associated with his school), they had a few girls on some of the "boys" teams (and no one seemed to care), in addition to having separate girls' softball and soccer leagues.