It's exactly what you asked for, an example of "You are wrong. You haven't learned it properly." You are also saying this kind of response (You haven't learned it properly) is appropriate. This attitude is what turns people away.
You can be honest, correct and still turn people off.
Comments
While it takes a while to understand how he approaches problems and solves them, his offer is honest and his judgment is correct.
He basically says that if the blog author actually had a look at the language before bashing it, he would have found valid issues.
I agree with that. The author's complaints are unsubstantiated and don't reflect the issues people encounter in reality.
It's exactly what you asked for, an example of "You are wrong. You haven't learned it properly." You are also saying this kind of response (You haven't learned it properly) is appropriate. This attitude is what turns people away.
You can be honest, correct and still turn people off.