I've heard the accusation many times from extreme right Americans. And I"ve heard the 'socialist' accusation even more. The two are often confused as being the same./——-/ At the age of 70, I’ve never met one person who thinks Canadians are or their country is communist.
In fact, few Americans even understand the meanings.
They are mostly of the opinion that capitalism that contains 'socialist' policy has to be socialism. In general they don't accept that there needs to be some socialism in every capitalist system.
I'll just assume you understand that for now.
If Americans 'did' understand they would have adopted a government run universal HC system years ago.