Dont want!!!

Why are they so fast in picking up negativity? Or are kids pessimistic naturally?
Kiiron's favourate phrase now is "Don't want"!

Do you want water? "Don't want"!
Do you want to sleep? "Don't want"!
Do you want to eat rice? "Don't want"!

"Don't want"!
"Don't want"!
"Don't want"!
"No"!
"No"!
"No"!
"Throw"!
"Throw"!
"Throw away"!

He is 20 months now. My little boy is growing up.