Opinions on alcohol vary. My RO had said beer was fine but not hard liquors. My ENT said no alcohol. For what it's worth, I was also a "social drinker" but ate tremendous amounts of avocado, especially after TX because the texture is so right. So the results of 14 months of eating massive avocado amounts: cancer recurrence in left tongue and lymph nodes.
Most definitely not scientific, but I don't think eating avocado is going to offset any alcohol damage, nor will it prevent or cure OC.