He's sealioning you, not arguing in good faith.

It's more effective to call out the behaviour than to continue to engage, since continued engagement makes it seem like there's a "debate" or "two sides" and that his side is the rational one that's "just asking questions".

That's bullshit. He knows exactly what he's doing. Trolling and trying to shift the Overton window. It's bad faith manipulation, not a conversation. Treat it as such.