Respecting your elders

you see this Arab walking in, and you decide to say “Assalamu alikum…” This person looks at you strangely.. and well! starts lecturing you in Arabic! luckily you have been taking classes once a week, and are able to make out something about drinking water in Ramadan while you should be fasting, you try to explain that this is for wudhu, but now your ears are being yanked and all you can do is lower your eyes in shame for a mistake you never did! You decide to say something about wudhu, but this person is like the energizer bunny, just keeps going on and on and on! Good times right?