I was talking to a friend from Mexico (she helps me with my Spanish and I help her with her English). In the course of the conversation, the phrase "I don't care" came up. She asked me where I wanted to sit in the restaurant and I answered with that phrase, meaning we could sit where ever she wanted. I asked for a translation, and she said that "no me importa" means "I don't care", but that in Mexico, it would come across as rude. She said it would imply that it isn't important, that you were being dismissive of something.
I was wondering if this is a regional interpretation of this phrase. I've seen the phrase before, though I have never used it in conversation. If it is insulting, I'm glad that I never have.
Any native Spanish speakers able to respond?