When somebody rejects all of the practical paths towards fighting imperialism and class exploitation, on the basis that they feel we should be taking a purer path, then you had better make sure this other path is viable. If it’s not viable, and they’re saying this simply to complain rather than to offer a serious alternative, then you shouldn’t even entertain them. Because what’s the point of validating somebody who has nothing constructive to say? Unless an option is practicable, it’s not worth bringing up.