Frank Grillo Sly Didn't Insult 'Tulsa King' Extras ... Casting Supervisor Wasn't Doing Job!!!
Frank Grillo's standing up for Sylvester Stallone ... saying Sly never insulted any extras on the "Tulsa King" set -- and the casting supervisor's lying because she didn't do her job.
We caught up with Grillo -- who's starring in 'TK' season 2 -- at LAX and he says he was on set the day Stallone allegedly launched a string of insults at the extras -- he claims it never happened.
Frank says he thinks casting sup., Rose Locke, got caught not doing her job properly ... adding we're living in a time where anyone can claim their feelings are hurt, and ya gotta deal with it.