Look at it from the other point of view.
I can honestly say that I've used the words "sir" or "ma'am" less than five times in my life. It's not how I was raised, and it's not my style.
I rarely hold doors open for people, unless they obviously can't do it themselves.
I easily get ****ed or annoyed at people, and find myself muttering obscenities a lot, but I'm sure people have done the same about me. Honestly, whatever. If you feel like being super nice, go for it, but don't get mad at people who are trying to find a way to get through their crappy jobs or might have just broken up with their boyfriend and are talking about it on their phone.