My dd is a lefty and would occasionally take BP right handed. The only benefit I could see was to show off.
any time a "should I leave" post reaches 500 words the answer is you need to leave, if for no other reason then to find out if the crazy follows you or gets left behind.
I agree with comments about benefits of occasionally hitting from opposite side. My buddy who is a high school coach will have players in a slump, hit some from the opposite side to focus more on the ball-- and it seems to work.
I agree with JJ's advice, though! Run away and see if the crazy follows.