Is it acceptable to say certain things to certain people

So a few days ago, I was playing a game and our Hecarim said he had to go because his cousin had, unfortunately, passed away the same day one year ago. We were all ok with it, when this Maokai makes a joke about his cousin dying. When Hecarim left, he made another joke, which to me is pretty unacceptable. One should never make the death of someone a joke, unless that person were on the same level with Hitler or something. But anyways, I was on the verge of losing my cadoodles and just straight up start saying things that I would end up regretting. But I didn't. I just said that what he said was pretty stoopid and something like that. Bottom line is, however, is it acceptable to end up becoming a "rage monster" or something if somebody says something way out of line or offensive? Would Rito end up taking action against it? Will there ever be an end to these questions!!??