Yeah everybody says all the refs love man united..
He over-reacted and it was silly but us people here on a football forum shouldn't be bad mouthing referees, refs are refs because they went through the course etc and refs most of the time do make correct decisions, they aren't bad people.
Also we don't know what Wenger said to the ref.. it could have been offensive or stupid.. we can't judge it as most of it wasn't shown directly on TV