Truly, a milestone in the annals of polyglot pissing contests.
"You are proving that your own methods do not get results with the langauges you've studied more recently, e.g., Arabic and Polish. Your failure with Chinese is an important, empirically real example: you need to re-examine the deepest assumptions built into your language learning advice. They are falsifiable and they are false."
And BTW, no: I did not respond to his earlier challenge by providing a list of all the languages I've studied, just three examples from three different language families. Apparently that was enough to get him to cut out the bullshit.