I'm the same way. If I get seriously bad service from a business, that's it. It's over. If I can help it, it will be at least another 17 years until I fly on BA again.

I ate at an Olive Garden restaurant (a large restaurant chain in the States) once in 1989. I didn't like their lasagna. Despite the fact that my wife once worked there as a waitress, and she really likes the food, my feud continues with Olive Garden to this very day.