This is just a very casual, even pop cultural characterization of how these two thinkers are commonly seen. I would expect people to have come across more substantive characterizations during an early high school history class, but perhaps I'm overgeneralizing my experience.
In any case, if you're looking for an approachable yet good book, I recommend reading Edward Feser's "Locke"[0]. The focus is obviously on Locke, but you can't really appreciate Locke without also getting into some Hobbes, which the books does.