Players are allowed to "to down easily" if they feel they have been genuinely fouled, ergo referees should treat each "going down easily" case on its own merits rather than resorting to blanket decisions just because a given player has "gone down easily" on previous occasions where no foul has been committed.
In other words, we need referees who are astute enough to make the decision based on whether it's a foul or not in the first place, rather than how easily the player went down... Any referee that bases their decision on a player's reputation, rather than the specific situation in front of him, isn't doing their job properly...