How to deal with a 5yr old who is a little jerk (I'm not the parent)

Hi all! I'm looking for advice on how to handle this situation. On sundays I assist teach Sunday school. My four year old is in the class too. There is this bratty five year old who comes up to me and says really rude things to me and my son. It's very laughable when he dies it to me but not to my little gu) but I don't know how to handle it? He doesn't do it to anyone else.Some Examples:First he goes to me "why are you his mom?" (Like why are you here) and I said "because I'm awesome"Then, at circle time the teacher asked everyone something that pleases God (help mommy, not kick my sister were answers) she gets to My little guy and he goes "why are you asking him, he doesn't know"Finally during free play time he comes up to me and says "somebody came up to me and said you're annoying" And I said "thank you so much that's wonderful"No one came up to him and said I was annoying. He was just being an asshole. 😂Any advice on how to deal with this kid? I want to show my kid a good example. via /r/Parenting http://ift.tt/2ep3U2l