I don't think this is the most pleasant way to be introduced to rationality, but irrational behavior as a teaching device has worked surprisingly often for me.

Most of the rationalists I know are self taught, and the reason they became interested in avoiding bias and fallacies in the first place is almost universally that they got tired of ridiculous arguments with someone else who was using them and began looking for rules that forced thought processes to stay a bit more sane.

Nobody I know appreciates being shown flaws in their own arguments, but if you advocate that we should stop using fireplaces on Christmas eve to protect Santa (for example), then sooner or later most people will come up with a good reason why your argument is irrational. When they come up with the rule on their own and you concede defeat, the rule is marked as a way to win arguments, not a tool other people can use to disprove my own ideas.

And once someone accepts that thoughts can be flawed and knows how to identify them, it is a hard habit to break. Each fundamental idea that helps you think rationally is slightly more easy to accept then the last one, even if actually applying them without help is still difficult.