They can't engage with your ideas, so they try to label you as the kind of person whose ideas aren't worth engaging with. It doesn't matter to them what you sai

They can't engage with your ideas, so they try to label you as the kind of person whose ideas aren't worth engaging with. It doesn't matter to them what you said, it must be wrong because you said it. Unless, of course, you agree with them, in which case you suddenly become worth taking seriously again.