play for a fool

play sb for a fool AND play sb for a sucker {US} (to treat someone like a fool, especially by trying to get something from them in a way that is not fair; to assume someone is naive or stupid) — держать кого-л. за дурака (недоумка, несмышленыша, идиота и т. п.)

Example: You are playing me for a fool! Stop it! — Ты меня за дурака держишь?

Example : Don't try to play me for a sucker. I won't have it. I want to know where the rest of the money went. — И не надо дежать меня за идиота. Не получится.

Example : He's playing you for a fool. Just don't lend him any more money.