Use curiosity
lesswrong.com
lesswrong.com
This makes it very hard to avoid concluding something prematurely. This is why it's so easy to mistake an association with something you don't like for a well reasoned refutation. This may be a part of the reason why prejudices of all kinds are so prevalent.
What I really like about LessWrong is that the advices are actionable. I had Philosophy and Sociology classes in high-school and I didn't get anything out of them because we weren't taught how to use the things they threw at us.
I think it is very unfortunate that rationality is not widely advertised as the tool it is.