Why are there so many people who hate twilight, and compare it with harry potter?

i mean come on??!! it's a bestseller! if it stinks so much then why do people keep buying and reading them? and all these things about harry potter? they're not even related. edward's a vamp and harry's a wizard! stop comparing them! i know that harry potter is genius but everytime i search for twilight here, there's always harry potter popping up! hey no fowl languages here ok?!