Phoenix Suns Exec -- TRASHES SPURS ... Apologizes to Fans for Having to Watch Crappy Team

Here's some quality white-collar smack talk ... courtesy of the Phoenix Suns.

A Suns exec grabbed a mic and addressed the crowd during the end of the Suns game last night -- and apologized to fans for having to watch the crappy Spurs.

It was so bad, the exec -- Managing Partner Robert Sarver -- told fans to send in their tickets and he would send them a special gift.

Sarver was so pissed because 5 big Spurs players -- and the Spurs coach -- didn't make the trip to Phoenix for rest and recovery reasons and he felt San Antonio screwed his fans out of their "hard-earned money."

No Tim Duncan. No Manu Ginobili. No Kawhi Leonard. No Patty Mills. No Tiago Splitter. No Gregg Popovich.