Short Side Crowded?

Just watched CNBC, and I didn't like what I saw.  Trader Peter Costa talking about bubbles and a time to go short and stay short for the summer.  Talking about the market going down today or tomorrow and testing 1150.  This makes me nervous thinking about shorting now that I hear this.  Peter Costa isn't the sharpest tool in the shed.  Not what I want to hear when I am thinking about putting down a short position.