tt is a zero sum game. every won point comes at the expense of a lost point for the other side. so whenever things go good for you(win a point), you are understandably happy. that exact situation is for the opponent a bad thing(he lost a point) and he is understandably unhappy.
expressing yourself very overtly for a thing that makes you happy and at the same time makes your opponent unhappy can, also understandably, lead to more unhappiness for the later.
people who are more empathic are more susceptible to being hurt by a cho-ing opponent, because they never or almost never do it to their opponents because they don't want to cause more, of what they believe to be unfair, unhappiness for them.
imo, cho-ing and the like should be punished by tt rules. some people don't care about it, but for some, it really messes with their game.
also, sometimes you hear defenders of cho-ing say something like "but this is just how i express myself". an argument which is obviously flawed. for example, if one would send dickpics to the cho-ing person's daughter after they would win a point against them and say "but this is just how i express myself", the cho-ing person wouldn't take it very well probably.