Patriots OT Trent Brown

WE GOT MAC'S BACK

New England Patriots star, Trent Brown is going from protecting Mac Jones on the field, to doing the same off of it -- telling TMZ Sports the quarterback's haters need to go kick rocks.

The Pats' left tackle didn't mince words while out at LAX on Monday -- saying he's a HUGE fan of Mac ... and doesn't get the criticism that surrounded the QB for most of this year.

Brown said he straight up "loves" the guy -- and anything Mac's critics say goes in one ear and out the other for him.

"They don't really matter," Brown said of the Jones haters. "Really, nobody outside of that building matters."

"It's all about who's in that locker room and who comes to work for us every day. That's…