There is a reason why past should be in the past. FB is like digging a corps up, thinking of a living.... too much garbage.
Ignore people like that. The only reason they are saying this is because you are an awesome person to begin with. Now the drinking is gone, its like a ray of sunshine on a clear face when everyone else has warts. However, sorry to tell you is that the abuse will not stop untill they shove you back into the bottle. Delete the losers. Get new friends.