re: My son was getting brainwashed at school and I couldn't articulate an argument.

Depending on what the topic is, you can search on YouTube or Rumble for that topic and then add 'Thomas Sowell' and see if he's commented on it - he's good at concise explanations. That may give you a frame of reference to shape your remarks. Also, there are old Sowell columns and books on the internet, some are free downloads. That might help if you want to address things yourself.