Hmm... I may be guilty of this. My dad and I are known to share the personality trait of "Keep things to yourself". On the other hand, my mom and my brother are more emotional. I'm constantly annoyed with how they're overreacting. I've been told that I'm cold and that I'd rather live as a fake, but the thing is, I just find these outbursts selfish. They're your own reactions to things that many others have gone through, yet you insist on bringing it down on others. Why would you do that? There are plenty of people in the world who've gone through worse, and it's not like I can't sympathize; I just feel like... You're... Overreacting, for the lack of a better word. The physical, audible, reactions aren't needed to express your sadness.
Of course, my codes of conduct aren't right. I know that getting your feelings out and asking for support is a much better way to live by, and maybe my views are formed from personal experiences. However, I just can't stand it. (by the way, the "you" is a general term)
Yeah, I can't argue with you there. I know nature definitely plays a part, but it's the where, when, how, and how much that bugs me.