STILL Not Potty Trained

This boy has worn pull-ups before, way back when he was excited about his new potty. That phase passed pretty quickly with Sid deciding it was too much effort to tell anyone in advance of when he needs the restroom. Recently one of his teachers asked me to start putting pull-ups on him again. She said that he uses the toilet at school. I hesitatingly agreed. See, with us, he still refuses to tell us when he has to use the bathroom. I've tried letting him run free for short periods of time, and he rarely goes without peeing on my bedroom floor. I figured that maybe he was missing the "feelings" of having to pee. Fine. But does he really not know when he needs to do #2?? Read this exchange that happened last night:

Me: Sidney, did you doo-doo?

Sid: No.

Me (more forcefully): Sidney. Did you doo-doo?

Sid: No.

(I take off the diaper and point to the load.)

Me: Sidney. Is that doo-doo?

Sid (saying with a straight face): It looks like it.

What??