I've never had a BD party given for myself, and have never attended one for a friend.
The company I work for gives BD parties for people born in a certain month and I go because I know it would be considered rude not to.
I don't think it is endearing to snub other people just because they have different ideas, especially on something like this which can easily be accommodated. Does it really threaten G-d's superiority to tell someone else "Happy Birthday"?