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ps- found this

There are certain well-defined and narrowly limited classes of speech, the prevention and punishment of which have never been thought to raise any constitutional problem. These include the lewd and obscene, the profane, the libelous, and the insulting or "fighting words" those which by their very utterance inflict injury or tend to incite an immediate breach of the peace. It has been well observed that such utterances are no essential part of any exposition of ideas, and are of such slight social value as a step to truth that any benefit that may be derived from them is clearly outweighed by the social interest in order and morality.

– Chaplinsky v. New Hampshire, 1942

Public incitement of hatred (s. 319[1]). Every one who, by communicating statements in a public place, incites hatred against any identifiable group where such incitement is likely to lead to a breach of the peace is guilty of [a crime].

– s. 319[1], Criminal Code of Canada

http://en.wikipedia.org/wiki/Fighting_words