I don't see any problem with the characters in ToS being bisexual, since even gay men feel attraction to women; it's part of male biology, just like lesbian women also feel attraction to men.
The fact is that nowadays there are people who think the world revolves around them and defend absurd causes just to get attention.
The fact that you're being attacked only shows that they're using you to get attention and vilify you. Do like the Brazilians do, "tell them to go plant potatoes," and continue with your great work. XD