I think we are discussing both a legal issue and a moral issue.
The legal issue will vary depending upon which locality it occurs and the moral issue will vary depending upon the individual.
It think FQ has stated a moral position and not a legal one.
I have often considered this question:
Should I be armed, which I always am, and am sitting at a table and a "bully" demands I move from his favorite table, what would I do.
Legally, if I simply ignore him and he lays hands upon me, I most likely will have a legal right to use deadly force to defend myself.
But, morally, I believe I would simply move to a different table or leave the premise.
Personally, I don't feel my proving I have a right to sit at that table is worth taking another's life.
I also know that moving to another table might not solve anything, as rolling over for a bully is likely to feed his desire to dominate but, being armed, I am not in a position to let the situation escalate into a "lesson giving" event.