So “I would take your politics seriously if it aligned with mine”? I am afraid that whole point of politics is finding compromise with people who you don't agree.

it has nothing to do with alignment of politics, it's that your description of reality is so wrong that it would be difficult to seriously engage

It’s more about good versus bad faith: you can compromise with people who are willing to be honest, but that isn’t possible when someone is redefining terms or contradicting all available evidence to make their position work. That commenter was conflating two very different sets of activities to smear liberals, implying that they somehow know someone else’s true intention even though that contrasts with their actions and public statements.