It is always sort of a strange moment when something you've written is received negatively. I go with the flow when it's for a client because, in family parlance, them's the brakes. I stay neutral and consider the feedback later when it's something I've written just for me.
But it is too, too sweet to have a phrase within a client piece that I just wrote be called "trite" by said client... except that it was called "contrite"!
You - rather, I - must laugh at it. Indeed, I had much remorse when writing such an ill-turned phrase.