You could consider refusing
Won't work. These people tend to think they know better, as if, for instance, a degree in English Literature somehow magically also conveys the insight to have a clue about IT. I've seen it a lot.
I have my own comeback. I joined Mensa specifically to piss off such people* :)
* No, seriously. I've never really found another use for the membership. I'm not a clubby sort of person, nor do I think that being good at logic puzzles somehow elevates me above the crowd. There are people who do far more impressive things than me, and when helping them is when I really enjoy my profession.