Oh, do not fall down that trap. Do not develop a taste for deliberately going to people you disagree with to argue on the social media, it is like doing drugs. At first you get a high like what you're described, you have all the arguments and retorts, and you're clever and verbose and happy to "show them all", but if you keep doing that you'll start getting into lengthier and lengthier arguments that will make you more and more frustrated. And then before you know it, you'll be sitting in your room fuming with the mood completely ruined, because you didn't have enough retorts and right words to get back at all the people teaming up against you after you've kept kicking the hornets nest (or because you got banned from everything) and now you keep walking around pissed off, continuing an imaginary argument with an asshole that is wrong on the Internet and wouldn't listen to you. Been there, done that, 0/10 do not recommend
Don't go seeking out assholes, they eventually find you everywhere anyway. There are a million other things more worthy of your time, talking to us here instead of pro-lifers on Reddit is one of them.
I don't think you'll be able to persuade them, and there is the reason for that. Not everyone wants to be saved - but that doesn't mean that no one does. They help some people, they just can't help most of us despairing SS folks, and the best we can do is agree to disagree and let them be.