@b0rk I would say:

"I CAN'T BELIEVE THERE ARE PEOPLE WHO FEEL THE NEED TO MAKE COMMENTS LIKE THAT AND ARE SO IGNORANT ABOUT HOW LEARNING WORKS" ...

... but sadly, I completely can believe it.

You do fabulous work, and while mostly I stand on the side-lines, and I'm sure you already know that you are doing amazing things, I just thought I'd say so explicitly.

You do amazing things.

Thank you.