etiquette

Hi everyone, I had a situation in my latest regional match that left me a bit puzzled, and I’d like to hear what others think. I won the match 3–1, and right after we shook hands, my opponent came over and told me he didn’t think it was fair that I said “yes” or “cho” on points where he made a...

If my opponent returns a net ball or edge ball and I later win the point, but not because of the lucky shot, am I still expected to apologize? Maybe my opponent recovered and later hit the ball off the table in the middle of a even rally, or maybe my opponent later had me on the defensive and...