Thank you for such an insightful distillation of human history. Now I can throw out all those stuffy old history books filled with irksome facts
You made an objectionable statement that the schoolboys who bullied another schoolboy for wearing a dress in a school play "aren't homophobes, yet, they are just anti-feminine". The reason your statement is objectionable is because you are not commenting on such behaviour, you're adding your own acceptance of it by saying such bullying behaviour is "just" anti-feminine. In other words "just" modifies the whole meaning of your statement.
Maybe you meant to say something else - just as you later, with considerable reluctance, corrected your mix-up between "feminist" and "feminine". Maybe you meant to say "These kids aren't homophobes, yet, but they are anti-feminine." That would be fine, merely an observation from you, not adding your own acceptance or endorsement of such behaviour.
But if you insist on sticking to your statement as it stands then I'd say this. There is a big problem - including, as we know, within the gay world itself - with prejudice, discrimination and worse against males who display feminine behaviour. Your statement was not made in the context of macho team sports - Tetrefine's point, where another discussion could be had - you were saying it in the context of playground bullying. It is your stated acceptance of such behaviour in that context that is unacceptable. So if you in fact meant to say something else then tell us