Why do people think weed is bad?

Especially ppl who have never tried it,get a freaking life. If u have and don't like it then that is u but keep your mouth shut. I am a proud pothead and that won't change for anyone. I have been smokin for over 2 years and I will keep on doing so regarldless of what people think. But really weed has helped me and made me smarter in many ways,it is GREAT for your mind. But I guess some ppl just don't get it.