what's happening to my cute, nice boy?

i picked michael up from school. here's a bit of our (my) conversation:

me: mikey how was school today?

mikey: silence

me: mikey, did you have fun?

mikey: silence

me: did you sing? play games? read?

mikey: silence, again

me: more, more questions

mikey: silence

me: michael, how come you aren't answering me?

mikey: silence

me: michael, it's rude to not answer someone when they are talking to you.

mikey: mom, i am trying to ignore you.

me: (a bit stupified) well, you need to tell someone when you don't want to talk.

mikey: okay, i don't want to talk.