They taught me worthless things. Nothing they taught me was beneficial, and it was not accurate. I didn't need to be taught the Trinity as false (I never believed in it before becoming a witless, and now I figured it all out). The year 1914 was hogwash. The Filthful and Disgraceful Slavebugger was not the same "faithful and discreet slave" that the Bible talks about. Holidays? I used Google to find out that Christmas is actually a sun-worship holiday in origin, but I celebrate it anyways.
What they refused to teach me is things of practical value. How to attract the opposite sex--had they taught me useful things along that line, I might still be in just for that (and it would be some value to offset the cost I had to put up with while in). How to make a reasonable amount of money (a reasonable amount of money is enough so I could live in a decent house, in a decent neighborhood, and not have to do without the practical necessities and common luxuries that the average person enjoys). How to live in today's world. All the advice they gave in those areas was total crap--none of it worked, even slightly.