Drake vs. Kendrick ? Cute. The real heavyweight grudge match is in the senior circuit ... 'cause Mick Jagger ’s new nemesis seems to be none other than George freakin' Thorogood !

Yup, TMZ snagged the vid -- 75-year-old blues-rock legend George exited Houston’s House of Blues Wednesday following his show with The Destroyers ... only to turn back, eye a fan and drop the line ... "You tell Mick Jagger he can suck on that," pointing at the venue behind him, to a few supportive cheers, with one onlooker exclaiming "U-S-A!" Gallery Launch Gallery Getty

For the record -- there’s zero known beef between the "Bad to the Bone" singer and 82-year-old Mick. So either George was flexing to claim he's the boss, straight-up trolling for kicks, or just tossing Mick's name out at ran

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