Ha ha ha ha ha ha ...... Culture shock!...
In Asia, at least from the part of the world that I come from, it is never considered impolite or unusual for someone to tell "why" he had been to the toilet or even for someone to ask "why" he went. Well, personally, as a little boy, I used to find it a little curious for anyone to reveal any such information or for anyone to even think of asking such things.
I guess I have got acclimatized to all these.
Well, to add on, you would be in for a greater shock if you ever decide one day to move to or work in a country like mine, where it is not considered rude to ask someone (even one whom he could have just met) personal questions such as "How many children do you have?", "How much are they paying you?"
Well, one of those things about culture!