Chicken. Wimp. Sissy. Yellowbelly. Coward. You know English, you know what these words mean.
Among friends, you can often get away with these sort of shenanigans, but if you do it in public, you shouldn’t be too surprised if an expert comes along just to hand your rear end to you on a silver platter. Unfortunately, these sort of players dominate in some places, contributing to bad attitudes in general.
Regardless, you should not resort to accusation of any label in order to resolve a problem you may have in facing off against someone; the civil thing to do is merely point out the problem you have once, and if they do not relent, you either learn how to punish their tactics quickly, or put up with it and leave sooner.
In moderation, these are tolerable; maybe even well-liked. In excess, they can be rather annoying:
Sometimes, the only trick up their sleeve is to pick Guile and use the fireball trap, or pick the most broken characters in a random KOF installment.