It's clear that you should have paid more attention to those classes that you feel are not very useful, as you might, then, have learned to read, write and spell properly.

You should also have listened more closely to the lecture in which the purpose of the university was described.

Clearly, there are scientists and engineers at the university who want to do research. They do, indeed, have to arrange for someone to pay for that research. They often do that by teaching undergraduate courses or assisting more senior faculty members by handling recitation sections and lab's or simply by grading papers.

Of these researchers, there are generally a few who are sufficiently articulate and patient to handle class lectures. They, in some cases, are even good enough at lecturing that students attend their classes and, wonder of wonders, actually perform adequately on examinations that faculty observers and administrators deem them competent to continue teaching as their primary task. They still are permitted, and funded, to do research, but since they actually seem to do the lecturing well, and even enjoy it, they are promoted to lecturing positions and, later, given tenure, based not only on their research, but on their lecturing as well. These guys do their research as post-doctoral students and tenured lecturing faculty. They teach instead of trolling for funding among commercial enterprises.

The tirades about what the O/P did or didn't do generally result from the fact that some fellows simply can't contain their urge to spout off about a given subject, germane to the current topic or not, in order to make themselves feel competent and clever. It's not helpful and it's not even always accurate.

People make mistakes, misread posts, etc. We can forgive that, and should. What's unforgivable is the spouting off about how something's good or bad, when it doesn't address the O/P's question. If you can't find something helpful to say, then don't. If a guy is completely understating or misstating his question then tell him about it. An online food-fight over whether the guy's right or wrong to ask a question is silly.

RE