Kyrie Irving went off in more ways than one in his return to Barclay Center Tuesday night ... dropping 36 points against his old Nets team AND also taking a jab at NYC Mayor
And, no, this wasn't a random diss directed at the mayor ... there's some bad blood here.
The drama began when a fan sitting courtside asked Irving ... "Why you didn't play like this when you were on the Nets?"
The Mavericks star had a response ... "Thank Mayor Adams for that, bro."
Of course, Irving, an 8x All-Star, spent parts of 4 seasons with the Nets .