Omg! I just had one of these earlier this week. Dumbass with a confirmation bias needs the size of Texas and a case of Dunning-Kruger that would make that one guy auditing a intro to "insert technical field" course that always knows the answer jealous. I am a degree holder in multiple integral fields to the topic, work adjacent to it and am a weekend researcher in the field and he was seriously trying to tell me that he didn't need to understand anything to tell me that his opinions were empirical fact that didn't need support. I tried to educate initially, but it became clear that all he was going to do was cherry-pick details out of context to support his opinion. I spent way too long. I just hope some other readers found the educational bits informational.