Keeping the "Christian" in Christmas

We were in a restaurant, and at a nearby table the waiter was wrapping up serving a party. Overheard:

Waiter: Happy Holidays!

Patron: Where I come from, we say "Merry Christmas."

Waiter: We're supposed to say "Happy Holidays," so we include people who don't celebrate Christmas.

Patron: First we were entertained by your stupidity, and now we're being entertained by your bulls**t.

Except this obviously pious Christian didn't censor himself with asterisks.