If you have no tolerance for people that try to belittle you etc - does it mean you got good self confidence?

Probably more then anything it shows you are impatient and have a lack of tolerance. Sorry If I sound rude, but thats the impression your question gives. Yes, all those "rude , belittling , undermining , slyly insinuates things" are terrible but they are usually only doing it to make themselves feel better by irritating you