Neymar's antics are "a shame" for football, Mexico coach Juan Carlos Osorio said after their 2-0 defeat by Brazil on Monday.
The Paris Saint-Germain star scored one goal and created another, but his performance was overshadowed by another incident late in the second half as Mexico midfielder Miguel Layun appeared to step on his ankle.
That caused Neymar to react angrily and roll around on the floor, but Layun did not receive a card.
"I think it's a shame for football," he said, adding that Neymar's antics had wasted precious time.
"We wasted a lot of time because of one single player. We lost our style in the second half, because of the referee.
"This is a very bad example for the world and the world of football."
Neymar, however, hit back at critics for "trying to undermine" him after the playacting accusations.
He said: "Look, I think it's more of an attempt to undermine me than anything else. I don't care much for criticism, not even from the press because in a way this can influence athletes.
"The last two matches I didn't talk to the press because there's so many people talking.
"I just want to play and I help my team-mates, I have to help my team and that's what I am here for, nothing else. I am here to win and I hope I can improve."