If a joke offended you it either touched a nerve or you just think it's dumb. If you think it's dumb, just let it be. it's not hurting you. If it touches a nerve, you probably need to think about your position.

So this is the core behavior that once upon a time we would have taught children. To basically learn from criticism, or mockery, and put it behind them. Parents instead started teaching children they should hear no criticism, long before we got to the point of legitimizing transsexualism. Moral laziness many years ago, purporting to be harmless, led us here.