Introductory Math - repost

The problem with taking lots of math and science at university is that you can take 300 or 400 level classes that are still called introductory. I took a class that was an introduction to partial differential equations. Four goddamn semesters of calculus let to an introduction class. What the hell is this. I take all this math only to learn, oh, by the way, there is so much other shit out there that you don't know and we just want to point out how stupid you are that we're going to introduce you to differential equations. There's lots more shit to differential equations but we just want to introduce it to you to point out how far you are from ever grasping this stuff. That's like an introduction to dating a model or movie star. Oh by the way, you're such a loser that we know you couldn't possibly get someone like this, but we'll introduce you just to point out how far from reality this could possibly be. Okay so I'm mixing complaints here. I guess the point is that after multiple semesters of math at a university you would expect to move beyond introductory shit and move on to...I don't know, maybe intermediate shit. God forbid I should get an advanced education and only get introduced to these concepts.