Have you ever noticed that when someone starts a sentence with the phrase, "I don't mean to be..." they always end up being what they just said they don't intend to be?

For example:

“I don’t mean to be rude, but you’ve gotten really fat over the past few months.”

or

“I don’t mean to be morbid, but I think you will soon die of cancer.”

It’s almost like they think that if they start a sentence with the phrase “I don’t mean to be…” that it makes whatever they are going to say totally acceptable.