This is a failure to understand responsibility here. The professor is not responsible for holding your hand and explain every little term—especially terms like

This is a failure to understand responsibility here. The professor is not responsible for holding your hand and explain every little term—especially terms like “office hours”, which are bog standard at literally every university. This isn’t some arcane obscure term—it’s college classes 101. College is a useful learning experience for this type of responsibility. You say its not “self-explanatory”? Good! This is a great opportunity for the 18-year-old to learn what to do when something is not obvious. Ask! Don’t just assume it’s irrelevant. College is a crash course in (small parts of) the real world. If you can’t figure out office hours, you’re gonna have a hard time when it comes to taxes, loans, and other real world things. And the consequences in the real world are much more severe and Real than a bad grade on a problem set.