I was using the phrase "suit yourself" quite often since the equivalent in my native language it is a legitimate way to express "do whatever you consider the best."
However, when I used this phrase in a dialogue with a person from UK, I was told that it is quite impolite. I goggled the phrase for clarification, but I did not succeed much.
There is an explanation at The free Dictionary which tells nothing about impoliteness at all. On the other hand, there is a discussion on ELU which implies it is impolite. There is also a link to the phrases.org which honestly confuses me.
Is the phrase "suit yourself" considered impolite, or is it sometimes impolite?
Has the phrase changed its tone recently (maybe due to the non-native speakers)?