100% agree, that it was the way the original post was written which is the problem. Or rather the fact that the post was written at all. It is a bit of a weird behaviour from the OP as someone who has been a member of this site for 10 years to not be able to deal with troll behaviour on his own. If I imagine that a woman would send me explicit pics of her vagina, I would just block her after a while and be done with it. I would definitely not go to an internet forum of any kind and "seek help" or want to discuss it. And I would DEFINITELY not take a screenshot of the vagina and post it. This and the fact that the original post comes over as rather homophobic does indeed suggest that the OPs motive for writing the post was not just a "general complaint".
Imho every man who has to defend his heterosexuality in such a vehement and public way, has quite a few internal issues to sort out. Whatever they might be.