Marcus Smart gets into a shouting match with fan in his return to TD Garden

Marcus Smart returned to TD Garden with the Wizards on Sunday. (AP Photo/Michael Dwyer)Marcus Smart didn’t play a minute in Sunday’s game between the Celtics and Wizards at TD Garden.

But the longtime Boston guard did find himself involved in a back-and-forth with a fan during the Celtics’ eventual 124-90 win over Washington.

During the game, a fan appeared to say something to Smart behind Washington’s bench — leading to the two exchanging words before the fan was escorted out by TD Garden security.

“Just crossed the line and we all know I don’t do line crossing,” Smart said of the fan after the game. “That was it. We move on. Unfortunate, you never wanna see that, especially for a guy who’s…