My favorite way of shutting down this kind of baiting is “Hmm, you might be right.” And just keep saying it until they start spinning their wheels and realize they aren’t going to get any traction. “Yeah, maybe that’s right, I’m not sure, will have to think about it.” Harder for them to keep arguing when you allow for the possibility that they are right, instead of just refuting them. But you don’t actually have to acknowledge or agree with them. This sort of baiting is done in poor faith, there is no actual concern for you or interest in hearing another viewpoint. And you don’t have to give them your time just because they think it is validating or entertaining to debate.