It always annoys me when people say stuff like that. A lucid dream is just a dream where you are aware. Everyone dreams, every night. All dreams are totally against your will.
Saying dreaming is evil, is equivalent of saying breathing is evil. In fact, if you never dreamed you would go insane and die in about a week.
Any one ever gives you a hard time you just follow it up with, "It is scientifically proven that everyone dreams every night. You just don't remeber your dreams." If you want to be an ass, add in, "Don't blame me because you have poor memory and can't remeber any of it."