I've been running a pathfinder campaign for a few sessions and one of the players is a powergamer type that discovered you can choose not to get a feat and rather get two traits as an equivelant.
Now, what he took from that is 'I can do the opposite and take drawbacks to get additional feats' although the trouble is, he's done it on a one for one basis, so he thinks he can get one drawback and then get one feat, so his character now has five feats (he's a level 2 goblin rogue)
Plus he has a positive trait as well
If I argue against this and say it needs to be changed he says I'm trying to nerf him or brings up GM fiat.
(For context as well, I don't design my campaigns to be horribly difficult to prompt, I try to maintain balance)
What do I tell him?