Red Bull motorsport adviser Helmut Marko (left) apologised for his remarks about Sergio Perez (right) last weekLewis Hamilton says Formula 1 needs to do more to fight discrimination in the wake of offensive comments by Red Bull boss Helmut Marko.The 80-year-old apologised last week after blaming Sergio Perez's inconsistent form for Red Bull this year on his ethnicity.Hamilton described Marko's remarks as "completely unacceptable" but said that he was "not surprised" to hear them.He added it was "not something you just apologise [for] and it's all OK"."I think there needs to be more done," the seven-time world champion said. "There…