Basketcase is one of the most intelligent and articulate posters on the board. But a childish hack like you picks up on a typo. Criticize his typing skills for adding a "T" if you want but it has nothing to do with grammar. Actually it is ignorant of you, unsurprisingly, to call it a grammatical error.Poor grammar and poor spelling are usually a sign of low intelligence though.
Just saying
You could learn a lot from him. I know that I have.
Just saying.