" "Kevin" is a bit unexperienced, does not reflect well, with "a slander grasp of the (English?)"

You would think someone whose sole argument that my grammatical errors make me a bad teacher, would be a little more careful in ensuring they do not make the same errors.
I assume that the people reading this post are either native speakers or people who understand the message is more important than the how the message is written itself.
In the immortal words of Bugs Bunny "whata maroon"