"Excuse me, are you a she or or a he? This question will dictate how my sympathetic nervous system will react, because obviously, like your own thoughts/opinion, I can just will my autonomic body responses to be a certain way. By magic!"

And thus, the dear lady (or man) had no fear at all.

Despite my words above, I am not that extremist in my thoughts or actions (and the tweet reads as sarcastic to me, anyway, thus my sarcastic dialogue).

If you act a certain way, you act a certain way. There should be no shame in automatically feeling fearful (or sad, angry, etc.). Sometimes, extreme emotions don't act on logic, and it takes time later to process them. This deals with experiences growing up, socialization, etc.