I don't want to be judgmental, and say this with the mildest of intentions (grandparent is just trying to make a contribution, and it would be good advice for some people), but as you point out - "lose your inhibitions" is
worse advice than "be a traitorous arse". To someone who doesn't know how to do something, 'alter your mental state and hope that works' is useless advice because holding a drink doesn't magically teach you anything. In addition, the realistic worst case scenario of "be an arse" executed badly is it doesn't work out for you and you stop. The realistic worst case of purposefully upping your alcohol intake is physical danger and lawsuits if you are purposefully exploring new levels of inebriation.
Plus the original question is office politics. Socialising is a small component of office politics if you don't want to socialise.