Customer is threatening to sue me, can he?

I'm a mattress salesman for some context. Long story short, the gentleman bought a mattress a little over a year ago (I didn't sell it to him, someone else did) and he wanted to file a warranty claim. After filing the claim, he was denied due to insufficient support (his bed frame was what caused the bed to sink, and eventually die). I called him to let him know about the warranty divisions decision and he was less than pleased. Fast forward a week and he came into the store saying he was going to sue the company and me personally for the decision. He's since came in two other times claiming he's got his attorney ready and I should get one as well. Is he just full of hot air? The gentleman doesn't even know my name.

It's making me very nervous, any help/advice would be great. thanks