Maybe an unpopular opinion but I think a lot of anti intellectual thinking is a combination of religious and corporate influence on the world.

Religion more or less teaches that you should believe what you're told, not what you discover or learn for yourself. It's a subtle but powerful way to discourage people from seeking the truths in life because they are genuinely convinced they've found the answer for everything.

Similarly with corporate influence so heavily a part of our lives people are quick to fall into the trap of consumerism. From a young age we are being conditioned to accept that it's normal to have to pay multiple times for the same product and to replace our possessions regularly. The cost of living that way makes the time and expense of continuing education unattainable for the average person, which often leads to bitterness about their situation and anger towards those who are able to work a white collar job or live an easier life.

Both are problems without quickly enacted solutions. People have to be taught to think critically without being put off or angered when they get to topics that contradict what they want to believe.