I'm an INTP. I also do not worry about little things at all. Someone spit on me? I don't really care. Someone yelled at me? Again, I don't care. I don't care one bit if it's too hot in a room or if a piece of technology isn't working quite like it's supposed to.
It's the big things that matter to me. I get really upset when a country declares war. I get really upset when education spending is cut, even when it doesn't affect me.
Other people are not like this. Are they different types? Which function most likely deals with this?
I'm leaning towards the S-N spectrum, but that's just because I don't really understand it.