I arguably try to think rationally (and posting on LessWrong, my thinking feels clearer [1], and it helped remind me to respond rather than react in one particularly trying recent situation), but this is why definitions and wearing them may be best avoided. I don't wear the label "rationalist", but I try to use the techniques found here to think better. This is not quite the same thing.

[1] which, using fictitous examples, reminds me of all the stories where the clearly batshit insane protagonist speaks of how clear their thoughts feel now. That is, their internal editor is on the blink. I hope mine isn't, but only results will tell me that.

n.b.: the parent comment may be wrong, but it's applying thinking in a manner I thought was worth encouraging. Hence, an upvote.