I can believe that blacks (particularly young black males) may be stopped more frequently by the police than other 'groups'. I've heard that often enough elsewhere. 

However I find it hard to believe people frequently make 'racist comments' in Toronto as I assume I would have witnessed some of this as I traveled around the city. And, quite frankly, I cannot recall a single instance where people directed racist comments at other people, including situations where someone got into an argument with someone else.