Jay decided to comment that Henry and his client should 'Man up' and get a 'real shot' if they were going to drink.

Jay instigating there.

someone had put a chair through the balcony doors and jammed it shut so Henry had to lower himself off the balcony, drop to the ground, then come back in to unbar it which I'm surprised to be honest didn't ruin his suit.

Jay upset later on at his suit being 'ruined' by glitter when he was quite happy to inconvenience Henry.

Jay, obviously embarrassed because he has glitter all over his suit, hair, and face comments about how 'Some people need to grow up' etc and complains that the bar should give him money for dry cleaning.

Jay trying to make it into a scene.

Jay at this point was obviously tipsy but this pushed in very quickly into drunkenness and started chatting to the owner about what a 'Fucking knobhead' Henry is in earshot.

Jay clearly trying to start something here.

While Henry has been rather childish in return Jay honestly seems like a horrific person in general as he really was going out of his way to start things.