Are tomatoes bad for you?

I would say no: I don't think we can make a blanket statement that it's bad for everyone. It can be bad for certain people, for example if you're allergic to it. Or perhaps if it gives you heart burn, then we can say its bad for you. Whether its good or bad depends on each individual person.

Eat 2 Beat CA, Pt.6: TOMATOES: Teeming with the antioxidant lycopene, tomatoes may block cancer by, among other things, stopping malignant cells from multiplying & by causing them to destroy themselves. Although tomatoes in almost all forms are full of nutrition, lycopene is more easily available to the body in cooked tomato products such as tomato sauce. (Ref: AARP, 5/2014)