Cena's usual facial expressions aren't any less goofier to be honest.
As much as I don't like modern WWE crowds, I thought the "You both suck" chant was pretty funny.
What bothered me about that segment was how Cena was pulling a Triple H and going off script to try to throw Miz off his promo. If anyone else had marble mouthed the venue name like Miz did, the other person would have just ignored it but John just had to bring it up and call attention to the mistake.