In Philadelphia, if an opposing player misses two consecutive free throws in the third or fourth quarter, the crowd gets a free Frosty from Wendy’s, which they call the Frosty Freeze-Out. It’s their rough equivalent of the free Chick-Fil-A sandwich offer during Wizards and Mystics games.
Thomas missed one free throw and then made the second one, prompting boos from the crowd. Two fans were particularly boorish and yelled obscenities at him. After, Thomas walked to the fans and calmly said “Don’t do that, bro.” A video is available in a column by Fred Katz of The Athletic (paywall). At that time, Thomas was ejected, per NBA protocol.
Thomas then elaborated on what happened here.
Isaiah Thomas said the fan he approached in the stands gave him two middle fingers and yelled “Fuck you, bitch!” three times: pic.twitter.com/z1Fk4LVKdW— Fred Katz (@FredKatz) December 22, 2019
Second half of Isaiah Thomas’ media availability after approaching fans in Philadelphia tonight: pic.twitter.com/BPrqihmman— Fred Katz (@FredKatz) December 22, 2019
The NBA also investigated Sunday and decided that Thomas’ actions warranted more action, hence the suspension.
According to reports, the two fans were banned for 12 months by the Wells Fargo Center, the venue where the game was played. Also, the season ticket holder who owned the seats lost the seats, but will get a refund. I assume that the holder did not go to the game.