Obviously not all gay men. I have many gay friends who wouldn’t dream of behaving this way.
I was at a party this weekend and saw a friend I haven’t seen in a long time. He tried to grab my breasts, did grab another woman’s, and forced my hands to touch his chest. He is gay and seems to think that means this behaviour is acceptable. I had another two friends in the past, who I no longer speak to, and they would often grab their female friends’ breasts as well.
It is absolutely not acceptable. The thinking appears to be that they obviously aren’t attracted to women so therefore can paw at their bodies.