You have absolutely no real basis at all. And if you're going to open up that can of worms, there are roughly a zillion other issues that have to then be judged harshly and treated with equal disdain.
That slut you slept with last night, the one you picked up for a one night stand from the bar. How dare you waste your time in such a shallow and frivolous fashion. Sluts are destroying the world!
What you're talking about are lifestyle choices on how people choose to spend their time. You might as well start taking up positions against homosexuality and judging people for their lifestyle choices more broadly, because it's exactly the same thing.