What he is trying to do get you to argue with him and then turn around and act innocent as if you are the being a bully . Do not engage him in any way and continue to ignore him . But do make note and write down events that will follow or things said around him or between you two . He is known as a “serial provoker” look it up or Google it . Do not play his game . When it comes to saying hello or good by , I will say ” hello everyone ” or ” see you all later ” , that way I included every one and know one can say I’m leaving them out or single them out which is probably telling others that is what you are doing to him , good luck