Well, the statement "I just don't get how anyone can't do this or that as well as I can" is an act of aggression in itself. It is an act of elevating yourself over others at their expense. In this case, these "others" are learners of English as a second language, who were probably not as privileged as you in terms of how good their lessons were, how frequent their linguistic input, how accessible English media ot them, etc.

So that's what I was reacting to, really.