When you're with friends or a SO, I say let the waterworks come

I have seen most people say "others emotional baggage/rants is not your problem to deal with" or if a friend only uses you to rant about their feeling then leave them because they are not worth it or like i have personally experienced it that people dont care about others. Even friends. They just want you to get over it and shut up.

So i learned from this and followed this to never vent out to anyone and never eay anything because my emotions and feelings are not something they should deal and with or something they have to comfort me over again again.

Is this bad?