I like the sentiment, but the advice is too often not practical. Also, not much to do with rationality.
Engineering a stable social life is certainly rational. I would not take this quote to mean "make random offensive statements to make touchy people leave you alone", but rather "be honest upfront about your beliefs and mental models, so that you can filter out people who react badly to them early on".
That is, it is good to politely and quietly (and perhaps indirectly) let people in optional social groups know early on if you are atheist/religious/vegan/liberal/conservative/rationalist/Klingon, so that both you and they can make inform...
Another month, another rationality quotes thread. The rules are: