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Dana White isn't pulling punches when it comes to Jon Jones -- telling TMZ Sports his decision to cuss out a police officer was just plain DUMB.

The UFC honcho appeared on the "TMZ Sports" TV show (airs Thursday night on FS1) and told the guys how he really feels about Jon's legal situation.

"When I get pulled over by the police, I'm the most polite human being you've ever met in your life," White said.

"There's no upside to talking back to the police. It's the dumbest thing you can ever do, especially if you're in Jon Jones' position."

There's more ... A LOT MORE. We also spoke with Dana about the huge Conor McGregor vs. Nate Diaz rematch at UFC 200 and what Dana told Conor before he accepted the fight.

Make sure to watch the ENTIRE interview on "TMZ Sports" tonight on FS1.