Hey Donald Whered You Learn To Count - Findsomewinmore News
Basic grammar may tell you the hey is an interjection. when used to specifically address a person (or an audience,) as in your example, the hey there is a vocative adjunct with an. Some people consider hey to be an inappropriate greeting (hay is for horses), but among those who do not, i wouldn't say that hey yourself has any inherently negative connotation.