This 100%. I taught myself *everything* in college. I relied on textbooks and online resources to teach myself the material outside of class. It worked pretty well. I wasn't the top of my class, nor have I retained all the things I've learned (but who does?).

Fortunately, what I have retained is the ability to pick up almost any subject and learn about it on my own. That's more important than anything they can teach you in a classroom.