And you base this off of… my belief that one should ask people to stop touching their stuff rather than immediately run up and beat the shit out of them?
I base this off of what you've said which leads me to believe that you think other people should act that way in that situation, but you'd do something different if it was you. We also don't know the intent of the grabber.
Were you dropped on your head as a child, or do you come by this level of violent sociopathy naturally?
Your histrionics may play better with someone else. Do you not think the owner of the golf club has any rights at all? Have you ever in your life heard of thieves scouting/casing a location, or probing actions that can be played off as "just looking" or "was just curious?" If someone carries your drink at a bar is the first thought that goes through your head "that guy seems just as nice as the guy selling roofie test kits"?
History decides whether a reaction or preaction was proportional or not, and they use context that we don't currently and will never have. Predeciding a course of action for every future interaction between humans at a personal, state, nation state level is just dumb. History is littered with people who suffered because they didn't believe something would happen and people who look back wondering why nobody did anything to stop a situation. I understand better why that is, now.