West Ham defeated Sunderland 3-1 in today's early kickoff.
Le Bris said afterwards: "They were better than us, they showed good quality, they started better, more aggressiveness and more composure with the ball. We were the opposite.
"The balance went in their favour at the biggening and their scored, it was well deserved.
"Our reaction in the second half was a bit better, we tried to change the dynamic of the game. We scored once, we have the opportunity to score the second but they were simply better than us. We have to accept it."
Le Bris also said: "It's tough to say, because probably there are multiple reasons. At least it shows that when you are not at the level that the league will punish you.
"(We need to show) Humility, hard work, accept the tough period. We haven't experienced this much, but we are still a newly promoted side and it is normal to have this kind of experience. Don't get too emotional, stay composed, not too high and not too low and move forward."