It also depends on what people boast about.
I don't have so much of a problem with people boasting about their kids as they are all wonderful and I can take it with a big pinch of salt.
I have a friend, however, who is always boasting about how massive her house is. I know- I have been there lots. I don't need her to tell me. Mabe I am a bit bitter because my house is so tiny. I genuinely didn't feel bad about having a ssmaller house than her but when I spoke to her on the phone the other day she kept going on about her ''massive'' house (again)and how lucky she was.
Not only do I now feel inferior but I have decided that people who boast in order to make me feel small are indeed being vulgar.
So there!