It would make more sense to me if this person was a heavy drinker. But as far as I am aware, he isn't. But I guess he could be. I really don't know I guess. He does drink and had a couple of drinks in him when this was going on. They are people in his immediate family that are heavy drinkers, so maybe it has something to do with what Maudcat said.
The questions about his behaviour are rhetorical questions and can't really be answered. I know this. No one can know why, he might not even know why.
I have just never been pushed like that up until now. At no point was I tempted to drink, there were other non-drinkers there but for whatever reason he singled me out and had at it and ruined the party for me.