I would ask sangha members to be mindful of their words and to consider whether what they are about to say constitutes right speech. The traditional test is: is it true, is it necessary, is it kind?
snarkiness aimed at another member of the sangha is neither necessary nor kind. I would go so far as to say that anything you mutter under your breath is probably not right speech.
and rather than apologize, how 'bout if you look at why you make those kinds of comments? what's the attachment here: to being right? to being superior? to being more intelligent?