This happened to me a couple months ago but it's been stuck in my head ever since and I need to get some outside opinions. I was at a bar for happy hour and I was playing pool with my gf and a couple friends. We were down to the 8-ball and as I went to go take the last shot I noticed a group of people sitting/standing in the way so I couldn't really hit the cue ball. I politely asked them to move and they all did... except for one. He just flat out said no. Now I've only been playing pool in bars for 3-4 years but I've still never had someone just flat out refuse to move for a shot like that so I was a little shocked. 

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We argued for a couple minutes before I finally decided to just take the shot. I had to basically stick my ass in his lap to make the shot, I'm not sure why he was cool with that but whatever. I made the shot, gave him a dirty look and then returned to my friends. A little while later we decided to get to my friends house party. We get there, go down to the basement to get some beer out of the keg and then see a couple people playing Beer Die. For those of you who don't know what Beer Die is, it is a drinking game that involved a coffee table, two teams of 2 players and a single dice or "die" that is thrown back and forth. I'm not gonna describe the whole game but the important part is there are 4 chairs placed at the corners of the table and it is required to sit in them to throw the die.

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GF and I decide to get next game so after a couple minutes or so we sit down and start playing. About half way through the game she runs out of beer so she gets up to get some more from the keg. I'm talking to the guys across the table from me and someone sits down in her seat without me noticing. I turn around and to my surprise its the SAME fucking dude from the bar! I was beyond shocked at this point.

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I told him to move because he took my GF's seat and we are playing a game that requires sitting down. He refuses, doesn't really give a reason but just keeps saying no and generally being an annoying prick about it. Now I'm not a very confrontational person. I know that's pretty cliche to say about these situations but I'd never been in a fight before this and I'd only ever lost my cool twice in my life. Both of which just led to verbal arguments. GF comes back and says its okay and just asks him to scoot back a bit so she can sit on the ground. For some reason this made me even more livid. He was just going to let her sit on the ground! 

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I'm not a very big guy but this kid wasn't either. If anything he was a fair bit smaller than I was so idk why he seemed to pushing me like this. I told him to move one last time and after he refused, I grabbed the arm of the chair and lifted it straight up so the two legs on the right side of the chair were off the ground which caused the chair to tip over and him to fall out of it. Immediately my GF exclaimed "OMG he didn't mean to do that, that was an accident" and in my anger fueled state I yelled "Yes I did!" He gets up and pushes me hard and I just blacked out. Next thing I know one of his friends has me around the shoulder's and is pull me off of him. Apparently I grabbed him by the throat and pinned him up against the wall. He was lucky his friend pulled me off of him before I could do any real damage. I was lucky his friend was fine with just pulling me off of him and didn't decide to beat me to a pulp because that dude was a big motherfucker. Also I don't know many people at this party as it is my GF's friends house so I'm also lucky I didn't get jumped by a bunch of people this guy was friends with.

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GF and her friend escort me outside all the while I'm yelling at this kid "That was twice tn! You fucked with me twice!" everyone probably thought I was nuts and I can't really blame them. My shirt favorite shirt had been ripped right down the middle, I was breathing heavily and probably had a crazy look in my eye. I go outside to calm down and then we go up to the owner of the house's room to cool off. He hears about it and sends some guys downstairs to kick them out. I let it ruin my whole night because I just couldn't comprehend what would make someone be that much of a dick and it almost seemed like he was targeting me. 

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That pretty much sums it up. I could probably expand on it a little more if anyone has questions. Before anyone asks I had gotten to happy hour pretty late so I only had 2 drinks there and I had about half a cup of beer at the house party so I don't think alcohol had much of an effect. AITA?

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tldr; Random guy refuses to move at bar while I try to take pool shot, then follows me to a house party and steals my gf's seat while playing Beer Die causing me to lose my cool and get into a fight with him.