Gloating 幸灾乐祸 is usually not considered poor sportsmanship, but it does show a lack of character. Gloating is the act of expressing great pleasure or self-satisfaction in the victory.
Taunting嘲弄 is directly insulting or jeering the opponent. It can be done after winning a point in a competition and after the victory. It is ridiculing the losing side and trying to continue the verification of which side is superior.
You have proved your point and do not need to emphasize that you are better in the competition.
