I don't think it's unreasonable to expect Gransnet to be for women, especially if one is new here - when I was looking for a decent forum, I initially thought Gransnet was aimed at women. The homepage articles appear to be mostly for women, judging by the photos for the articles.
However, I had a good look at the forum and saw that it is in fact welcoming to men as well. So here I am. A sixty-something (not too grumpy I hope) bloke.
As with any forum, members shouldn't have to deal with unwanted attention, and blocking / reporting is the right thing to do.