Education was the very first thing you asked. Not age, not sex, not religion ... you went straight to education. As if your inner monologue thought "Right, flat earth society. They're are idiots so I'll ask them about their education, and form my conclusions around that. Should be an easy A grade here. Oh, and to make it look like a survey, I better ask some other questions too. What to ask? Erm, age, sex ... yeah, starting to look like a survey now. Juicy worm stuck on the hook. Now to cast it out and catch some halfwits".
You led out with the wrong question. Your intentions to humiliate, not understand were clear. Still, I guess you learned something after all.
Demographic data is usually near the top/front of questionnaires, but that doesn't make them the most important questions. If a survey asked if you identified as a man or a woman before diving into the meat of things, would it be sexist? If it asked your ethnicity, would it be racist? If it asked if you were religious, would it be antireligious?
It was a simple question, and one that I'd also be interested in the answer to if I were running the survey. If you feel like you're being talked down to, insulted, or attacked when an anonymous voluntary survey asks what your highest level of education is, you should probably take a step back.