They'll ask for specific evidence, then when presented with it, find some excuse to ignore it, like tone policing or attacking a source for being "illegitimate" or "biased" without even reading it.

I've been playing with dropping non-sequitor ridiculous links as "sources" in sincere comments, and I have pretty solid proof that liberals arguing on the internet almost universally do not click the links for sources.

I've done it quite a bit, and the only people who acknowledge or comment on it are comrades from here.