I guess you could put that myth in with the opinion that Canadians all speak french, drive dog teams and live in igloos.
French courses are offered in the CF as an option. I believe officers/senior NCO's require second language training for promotion but at the JNCO level, a second language profile will be "points" toward promotion.
If you dont want to learn french, the only hinderance will be that if your peers take the training, they will be better qualified than you.