I am against this statement
Reason 1. It's too general. Logically, it can be disproven with just one counterexample, i.e. Because I watched True Blood and Buffy the Vampire Slayer, I was inspired to write Gentle Werewolf, which has led to wonderful things for me.
Reason 2. It uses an ad hominem attack. Regardless of whether it is a waste of time, I would never label someone stupid. I don't know their reasons!
Reason 3. Some people suffer from mental and/or physical ailments that prevent them from certain activities. If they get pleasure from TV, it's certainly not a stupid waste of time.
Reason 4. We're always learning, whether we intend to be or not. TV might have an ill effect on the psyche, but that doesn't make it a waste of time. If someone goes into a room good and comes out of the room evil, we would give the thing that happened in that room a negative label, but not "waste of time"
Reason 5. Time cannot be wasted. It is used. It also cannot be saved. It is always used. It's not like I can rummage through the time wastebin and collect the time other people have thrown away. Nope, they used it. Used it all up! I need MORE.
Reason 6. We're all addicted to time. If watching TV helps people kick their habit, more power to them.