Why was David Beckham red-carded in the 1998 World Cup?

In the second round of that competition, he received a red card in England's match against Argentina. Beckham had been fouled by Diego Simeone and the two players were lying on the pitch in close proximity to one another. As Simeone attempted to raise himself from the ground, he placed his hands on Beckham's back; Beckham was seen to wince in pain as Simeone regained his footing. In what Simeone himself described as an instinctive reaction, Beckham, still laying face down on the pitch flicked his leg towards Simeone striking him on the calf. Simeone later admitted to trying to get Beckham sent off by over-reacting to the kick and then, along with other members of his team, waving imaginary red cards at the referee, urging him to send Beckham off.

David Beckham wasn't red carded in the match against Portugal, he simply got hurt and was replaced, the other player was the one red carded, I think his name was Rooney, or something close to that.

For kicking another player when he was on the ground.

NOTE: Chris M...the questioner asked for the 1998 World Cup.

He kicked out at an Argentine player while he (Beckham) was on the ground

For a retaliatory kick against Simeone after being fouled by him.

after being fouled, and while lying on the ground, he kicked out at an opponant,(missed), and was red carded for intent

kicking out at Diego Simeone

because David make foul to Simone

in the game against Argentina, he hit Simone

He committed an infraction.

TFTP