Liberalism is the ideology of capitalism. They emerged together and the former was formed to justify the latter. Over the years it has branched out and there are many forms such as classical liberalism, neoliberalism, social liberalism, etc. but they all defend capitalist property rights and the market. Socialism emerged as the working class response to/critique of liberalism. In the US the term only refers to social liberals, who are in reality centrists. Americans call them leftists only because centrists are slightly to the left of right-wing politics.

We're against liberalism as a whole because it's the ideology that justifies capitalism. We're against social liberals because they're seen as fence-sitting cowards and dangerous compromisers.

Canada's two main parties are both right-wing. They support capitalism, and the rule of capitalists over the economy and government. The canadian conservative party agrees with them in that.

Or look at Australia. Their two main parties are Labour vs the liberal party (both are pretty right wing, but in that country the liberals openly position themselves to the right of the other party).

Or take Japan. Their far right party is called the liberal democrats.

This is a discussion about liberals in the US, not the liberal party of Canada, which is decidedly left of US politics as a whole.