lowering, bad on balljoints?

i heard somewere that lowering you car is bad on your balljoints. is this true??

Theoretically, yes it would be. But it isn't like they will wear out in six months or anything. You will never be able to tell if the cause was because of being lowered or not.
I slammed my car at 112,000 miles and kept it lowered for seven years like that. I didn't have to replace my ball joints (which were factory) until 240,000 miles and I was not easy on my car.