Apparently, such people are called "Patriots".
I actually felt physically ill after watching this piece on The National (h/t to Impolitical, Alison and others), in which Erik Millett explains what he did and did not do in regards to the playing of 'O Canada' in his school, and describes the phone calls, the emails and the death threats he's received since this story became a Conservative cause célèbre.
He hadn't been back inside the school in over a week. He's not sure he'll ever teach again.
The woman who first raised the hue and cry is also interviewed in this piece, and shows us exactly where she's coming from:
"First we lost saying the Lord's Prayer in school, then the Pledge of Allegiance, and now the singing of O Canada..."
Yes, Mrs. Boyd, we really have lost something essential here. What we have lost is the ability of too many of our citizens to distinguish between our country's traditions and institutions and those of the United States.
What we are struggling to keep is the culture and tradition of fairness, inclusiveness and accommodation that makes this country unique among nations. A tradition that predates Pearson and Trudeau and any modern notion of 'political correctness' by centuries. A tradition born out of our earliest efforts to live with and among the First People of this land, then out of our unique partnership of French and English, Protestant and Catholic in a single nation, and later out of our inclusion of other newcomers representing cultures, languages and faiths from every corner of the globe.
All these are woven into the fabric of our nation, each thread intact. This is our great strength. This is Canada. It always has been. Where have you been living, Mrs. Boyd?