You should question your unstated but fundamental premise: one should avoid arguments with "hostile arguers."

A person who argues to convince rather than to understand harms himself, but from his interlocutor's standpoint, dealing with his arguments can be just as challenging and enlightening as arguing with someone more "intellectually honest."

Whether an argument is worthwhile depends primarily on the competence of the arguments presented, which isn't strongly related to the sincerity of the arguer.