Nitpicking. You know what I meant.
I suppose you could say that I'm nitpicking
but nearly every time I mention a mistake like that, it's actually to help them (that is, not when it was just an accident)
because saying it in a real situation could be embarrassing (for example, "all be it" instead of "albeit")
in this case, if you'd said that on a more "hardcore" forum, some annoying elitists might pick on you for it