Pretty bad look for Burnes in my opinion. I don't recall seeing any other players making statements like this after losing an arbitration hearing, but it's possible I just missed it.
There's a lot of things we don't know here, but the thing I would be most curious about it who wouldn't budge off of their number to avoid arbitration. Could easily have been both parties.
We're never going to know, but it would be interesting to find out.