I have sent many missives to the woman outlining her numerous failures and shortcomings. It did not faze her. Usually she did not bring it up. Once she asked if I really believed what I sent. I said yes. I asked if she believed anything she ever said. She said yes. That was the end of it.
I have heard of some of those guys getting pissy when their failure was pointed out.
I think the bigger concern is if there is an expectation of a reply or getting a bad reply.