Why won't the players be present at the anthem during the second MLS game?

The second MLS game is delayed because the weather is not favorable for the development of the game. However, it is essential to know a particular detail of the match, why the players will not be present at the national anthem. 

The first game between FC Dallas and Nashville Soccer Club took place days ago, a game in which the players knelt during the national anthem in respect of Black Lives Matter. Unfortunately, this provoked boos from a group of fans who were against this decision. 

Reggie Cannon, a player for FC Dallas and the United States Soccer Team, and several people linked to the game were annoyed with the fans' attitude. For this reason, players and coaches decided not to be present at the anthem during the second match. 
The game is expected to take place today. However, we already know the team members' decision for the second game between FC Dallas and Nashville Soccer Club.