This is just a small addendum, if a bartender offers you a free drink and you turn it down, you will never be offered a free drink again. This is universal. Also universal, if you suggest to a bartender that they should give you something for free, you will never, ever get anything for free from that bartender. These rules don’t apply to close friends/girlfriends/boyfriends/siblings/spouses/people the bartender is trying desperately to bone.
That is all.
Main post is below. Thanks.