Fulham took the lead against Chelsea but were denied by VAR. The refree had cleared it as a goal but the VAR claimed there was potential foul when Fulham player took possession from Chelsea. Fans are sad, these late minute denial of goals due to an event further in the past would decrease the credibility of VAR.
The accident that happened in the midfield between Chelsea player and Fulham player is a clear foul, and Fulham fans shouldn't be mad because VAR is right to call on the referee to review the accident, and that's the reason VAR was introduced into football. Sometimes VAR makes mistakes, but this time VAR is 100% right to cancel the Fulham goal because Fulham player stepped on Chelsea's player foot in the midfield.