Nope, I have never had a problem from touching them, I touch each and every one of my primers that I put into the rounds, and have never had any problem. I have used CCI, Federal and Remington, but never Winchester.
Maybe he is keeping his hands too clean when reloading. He should have a nice layer of powder residue,lube if using lead, and fresh powder, etc, basically his fingers should be a nice grey color. That is what mine usually end up looking like and I have had no problems.