I always did wonder why Fat drinks at a bar by himself. Bars are expensive, and i mostly go to them while on vacation or hanging out with friends. I'd rather buy a 12 pack at a store since it's cheaper, or go buy those exotic beers and buy their random packs.
As a former bartender and occasional lone drinker the explanation I can offer is sometimes one likes the feeling of being alone but surrounded by social activity.
On times when I have been living dirt cheap in single rooms, it’s nice to just get out.
Not having like a living or tv room, even if you wouldn’t do anything other than stare at the TV next to other people, one can find yourself craving just a bit of other people in the surroundings.
Personally, especially feeling drained after work it could give me a bit of a feeling of recharge, self reflection and peace.
Also it can be nice if you randomly bump into someone you know or strike up a conversation with another lone drinker.
Of course that can be risky as they can obviously turn out to be a problem, but then other times can turn into hilarious fun unplanned nights!
However I don’t think any of these things apply to Fatrick so either he is just an alcoholic trying to LARP as a hard drinking tough guy or Niki throws him out most nights so she can entertain the fellows who fart in her vagina.
With regards to him no longer being at Hooligans, I said a while back and I am convinced now, he likely considered himself an unofficial bouncer/manager and caused problems by getting involved in customer complaints and scuffles.