During the Boston Celtics' blowout loss to the Toronto Raptors on Tuesday, the TNT microphone caught Celtics head coach Brad Stevens saying the F-word to a referee after a call he didn't agree with.

According to Stevens, it was his first ever F-bomb and he's upset it got caught on the audio.

It was just a terrible night for Brad Stevens and the Celtics on Tuesday. They got embarrassed by the Raptors on national television and looked like a team that was just waiting for the game to end.

With the loss, Boston dropped to 37-24 on the season. They are in the fifth place in the Eastern Conference standings and have lost three games in a row.

There was a point last season when people were labeling Stevens as the best coach in the NBA. That dialogue hasn't come up this season, though, as many Celtics fans have become upset with Stevens because of his poor rotations and other coaching strategies. It's amazing how a narrative can change so quickly.

The Celtics host the Portland Trail Blazers on Wednesday. As we have seen this season, the fans in Boston aren't afraid to boo their team if they are playing poorly. A loss on Wednesday will surely bring out the boo birds again.