In my opinion, yes, boundaries are different for every person. I have thought about how the two examples you mentioned fit with similar experiences I have had and I can say I have reacted the same way you did, at times. For both examples, I think maintaining a calm, clear and focused mind to get things done and help people instead of aggravating the situation through aggression on your part - could be considered a strength of character that you have. Nothing to be ashamed or embarrassed about, quite the opposite in my opinion. You may have a highet tolerance to some things than other people, and thus a "lower reactivity" as you said, maybe. Is this something you would like to change - are you hurting yourself by feeling/acting this way? If you aren't, then I don't think you need to worry any further. I'm sure that the people around you, although they may not directly show it and it may be difficult to see, are grateful that you don't snap back at them and return their pissed off/aggressive tones. It's a strength of character that you have and they lack.