For many, it's cockiness for sure. For those like myself who won't vote for POTUS this year, I sit and evaluate both sides.
Trump, thus far, has not been challenged in any debate with respect to his long history of being a failure in business. He won't be able to hide behind his lies about being a 'yuge' success in business, as Hillary will certainly have all the ammunition she needs to make his head explode.
Trump is simply not able to keep his cool, and stick to policy or fact based discussion.
Once another woman bests him on a national stage, he will suffer a complete meltdown.