Sometimes one bad experience is enough to make you shrug your shoulders and say, "enough of that". It may not be logical--and you may realize intellectually that you should give the restaurant/store/candidate/volunteer experience a second chance, but emotionally, you're turned off and see no reason to pursue it.
I'm very careful now about offering to do meals after one bad experience years ago. A woman at church broke her wrist and needed meals. I offered to do one, thinking that I would bring a frozen meal to church, where she could pick it up, and then she could thaw it and bake it when she needed it. Her expectation was that I would bring a complete meal (entree, salad, dessert, etc) to her house at dinnertime, which I wound up doing, driving across town during rush hour.
It sticks in my mind because her husband worked full time, but was able-bodied, and her children were old enough to help out. She wasn't bed-bound. Ironically, I had tendonitis in one wrist, and my husband had broken a bone in his hand so we had one pair of hands between us, and our children were younger than hers, but we were managing.