And including cold veggies in a plastic bag counts as exposure? Where others aren't eating it?

I'm all for science, but you also have to have common sense or you'll missapply the science. Children aren't machines, they're people. People can be communicated with. People are less adverse to new foods when they see others eat them. People have their own tastes

If your kid doesn't eat the little bag of carrots, maybe find out what veggie they would eat and continue to expose them to carrots on more palatable terms