Is it smug? I didn’t know that. I have spent enough time in Hindu places that I think that’s good to know.
It's not clear to me how the correction of a cultural nature is being smug. The poster in question even admitted it was a "small nit", but it's still useful information for both the poster, and other readers.
This is a quote from the Office, which leads me to believe it's at least a little tongue in cheek.