No offense, but it kind of seems like you're looking for offense if you think that it's rude.
He said, 'question to the masses,' meaning to anyone happening to read it, followed by, 'if you are...'
How is that painting everyone the same?
Again, I think that his point is valid and the request a reasonable one.
Example A:
All TKD sucks. Why because I sparred one guy and I beat him. They do not learn Elbows until rank X and we learn it at rank A.
Yes this might be the bottom of the slope, but when you paint in broad strokes you get broad replies.
Personally I know those who have trained and do train TKD. I have no issues with the system(s). It is not for me, but then I ride a Cruiser while other ride a Sport Bike. Personal Preference.
If you have an issue report it.