It isn’t pedantic at all. Capitalist countries like the Nordic Countries may have more social safety nets (even if they are slowly being picked apart by Capital), but that doesn’t make them “Socialist.” Using Socialism as a moniker in place of public ownership obfuscates how the entire economy is run, and in whose interests. The post office in the US, for example, primarily exists to work with the private sector and help smooth it out. Social programs aren’t Socialism.

You’re also on the community for Communism, you’re going to find people more strict and clear with using terms like “Capitalism, Socialism, and Communism.”