I don't like girls

At what age do boys and girls start declaring their disdain for the opposite sex? You know, cooties and all that icky stuff. I thought it was in elementary school. Apparently, like many other things, kids are starting younger these days :-P

We'd recently switched around the routine. Whereas during the first week Mommy dropped Todd off and Daddy picked him up, we switched it the second week so Mommy could get in early and get some work done (as her main source of assistance was in a timezone 3 hours ahead). Todd didn't take kindly to the change, and kept insisting he wanted it back the other way. Finally, he offered Daddy a reason:

"I don't like Mommy!"

Taken aback, Daddy asked him to elaborate. So Todd did:

"Mommy is a girl. I don't like girls!"

Awwww... :'(