Thanks for your input regarding critical thinking skills. Below are my suggestions for you, inspired from CBT skills. Normally it is a faux pas to point out cognitive distortions in other people's thinking, but looks like you're up for a direct conversation so I'll reciprocate;
- don't read minds; dialectic can only happen if we allow the flow of conversation back and forth. Cutting that flow prematurely happens for example when we assert that we know what the other person is thinking.
- don't use should statements; don't enter the scene with imperatives and normativities. At best it is insulting to fellow adults you're talking to, at worst it again kills the dialectic. Conversation requires trust in the other person being able to unpack and reality test what is being said. It requires an assumption of good enough character. Talking down to people is a self fulfilling prophecy; when you show you have very little expectation in having a good faith conversation you have already created it.
- let go of black and white thinking; simple categories are useful but have serious precision errors. I invite you to consider "truth", "knowledge", "validity" as shades of gray instead of discrete categories while talking to people, because it allows parties of a dialogue to puzzle together the subsets of truths they have.
- don't overgeneralize; don't take a comment and overgeneralize that to a person's essence e.g "they are a person who always does this". Don't take a few comments and overgeneralize that to the entire forum. Don't use labels.
- don't discount the positives and filter in only the negatives; instead of focusing where people might have missed your expectations in critical thinking, see if you're downplaying or outright ignoring when they are in fact demonstrating it.
Hope it helps.