Quote: scarletpeople in poker who raise before there are any cards on the table.
You've just got to be patient, Rox. If they want to raise the flop, fair play, let them buy the pot. If nobody calls their bets, they'll eventually get bored of doing it and leave the table. In the meantime, chances are you'll get dealt some good hole cards and can call their bluff when there's a higher probability of winning the hand.
Sometimes, the player raising the flop could have good pocket cards, so in that case, it's actually a good idea for them to play aggressively and force the weaker players out of the game. Just watch how people play and don't call for the sake of it.