You took one person's picture and put it on another person's picture. He took your picture of two other peoples' pictures and put a third person's picture on it. Nobody involved is really a creative genius here. Let's all just chill.
I'm not even saying you didn't do a good job, but to throw a hissy and call it stealing when it was, if anything, a parody, is just overkill. If he'd taken it as is and said it was his, sure, that's one thing, but he wasn't try to pull the wool over anyone's eyes. Let's just enjoy these pics for what they are, and try not to blow things out of proportion, shall we?