What baffles me is that people would had thought less of his opponent if he didn't allow him (like you said, "you have to be a wanker").
Because why wouldn't he have cloaked? If you want the win so bad you would refuse to let me say, "oh she's cloaked btw" I would just concede right then and there. "There you go mate, here's your win, well done."
The question is not why he wouldn't, but if he did.
And he didn't.