Dives do not always get yellows because they are not always blatant.and None of the blatant dives rarely get Yellow cards even now.
That one was.
The thing with arguing with the ref resulting in a yellow?
Whether you agree with it or not (And I am HUGELY in favour of it), its the rules now and every player must go in knowing the rules.
I mean what is point arguing with the ref, have you ever seen a ref make a decision, get called a "blind ****" by a player then go "oh okay, I guess I was wrong" and reverse his decision?
Ref don't get paid to allow overpaid ****ing brats to give them abuse.
Costa just needs to shut the f**k up and play football

