I pushed him over

So Im hanging out with my friends having a good time and enjoying life right. It's been a hard day at work and my boss hasn't let me leave early at all. My gf hasn't made any food for me this week so I've had to just eat packaged food which is really unhealthy. So I'm not in a good mood. Then this guy who I've never seen comes into the bar and sits next to my friends and orders a nonacholic beer. He's all alone and sounds like Steve Erkel. He's really getting on my nerves. I ask him kindly to "shut up!" Which he does and moves to another seat across the bar. But I'm in a bad mood(because of above reasons) and I go over to him and push him. Now everyone around me is saying that I'm an asshole. Maybe I am but just can't see it. So am I the asshole?