The Patriots got rocked by the Jaguars on Sunday ... and for that reason, Kevin O'Leary is OUT on them -- at least, that's what the "Shark Tank" star is telling TMZ Sports.
ICYMI -- the Pats got demolished by a team in the regular season for the first time in a long time, laying an egg in Jacksonville, 31-20.
Well ... O'Leary -- who's a huge New England fan -- sat through that whole loss ... and wasn't happy with ANYTHING he saw.
"Tom, listen to me buddy," O'Leary said of his message to the Pats Hall of Fame QB.