This is really true. When we are young, men make friends easily. Then most of the more sociable ones get married, and if there is anything a typical wife is not fond of is her husband having single friends.
What I call quasi-friendships are one possibility. You may share some sport, and get together to play. Sometimes it can generalize from this, sometimes not.
OTOH, women are often available as friends for single men. And women make good friends because they are not afraid of feelings. Male friendships can resemble jousting, which is fine when you are 30 but gets old when you are 60 or 70. The rub with cross-sex friendships is that some number of them detour to bed, and if you or she already have a man-woman thing going with someone else, this is awkward. I have made a good friend in one guy who lives in my building.He might borrow cooking oil or some utensil One day he asked me to borrow some Viagra. I guess my age made it seem likely that I might have some. When I said I didn't have any, he explained that it was for a friend. True friendships IMO are often made when you have been drunk together, or somehow exposed more of your true self than many men feel comfortable doing (or observing). This is part of the reason it tends to be easier to make deep friendships when you are young.
Regarding meetups, most of them that are general interest or neighborhood based tend to be mostly women, which for a man who is not looking specifically for a female can be tedious, especially in a hyper-liberal, hyper-PC area like Seattle.
Ha