Not true at all. My favourite hockey team next to the Colorado Avalanche is the Vancouver Canucks! I grew up in Vancouver and have never thought “Canuck” was derogatory.
Being an 81 yr old of French Canadian descent on my mother’s side, I can well remember when the term Canuck was very much the same as the “N” word. However, it has now become an acceptable, although not preferred, term for this particular group. I certainly take no offense. Snowflakes will take offense at anything and everything while crouching in their basement hallows.