Like others have said, you didn't get called out at all: you called yourself out. Of course he knew it was a rep after you told him it was!
For the record, the following is getting called out:
"Hey, check out my watch!"
"Ugh, where'd you get that fake piece of crap, Canal Street? I hope you didn't pay too much for it."
The following is not getting called out:
"Hey, check out my fake watch! I got it for a couple hundred bucks from China ... but doesn't it look just like the real thing that costs $20,000?"
"Nah, I knew it was a fake: the bracelet is too shiny."
Cheers,
Ari