WIY,
While I agree that people look for excuses not to do mitzvos and that there is merit to exploring whether my son was drinking enough, staying in the sun too long etc., I would not respond to a question a person asks in such a sarcastic tone. Comparing possibly being overheated from a second layer of clothing is NOT the same as saying maybe I got a headache from a Kippah. Your wish to make a point/teach a lesson is lost on your silly comparison. Take people’s questions more seriously, and be Dan lekaf z’chus that someone wants to do the right thing and is therefore asking and answer respectfully.