I see quite a few commenters here who posit that it is appropriate to mock someone who is frummer than you. I do not see any justification. They are offended when someone looks askance on someone utilizing a questionable kula, and that is a horrible avala. But making fun of someone who decides to take a more machmir route on something is appropriate.
Fascinating.
Now I know Gavra is going to say that what he does is meikur hadin. Possibly. He has not convinced me of that. But the truth is, that most people who accept chumras are doing it lishma and they are genuine. Some are not, but that gives you no right to make fun of someone who is genuine.