PR is an awful system by and large and not really relevant to this. It is a pity that any excuse it sued to try to push it as if individuals in a political party is the same as the party itself.
The presidential election is the whole population making a choice between the candidates for a particular job. In such a case a single count, where every individual vote is treated the same, is the most democratic option (as was the case in our recent referendum); so the electoral college system is rightfully criticised. However it is the system everyone accepts they compete under prior to the vote, so there is not any cause to bellyache about the result afterwards.
Ultimately, however, the vote has still just appointed an elite who need not take any notice of the democratic opinion of the people thereafter.