I don’t think there’s any real evidence to prove he’s being stressed out…in fact I’ve seen comments from fellow comic professionals that suggest he’s excellent at just ignoring irritating stuff.
My own take on it is that many people that interview him are overly obsessed with his DC/ Marvel relationship and at some point of most interviews will ask him what he feels about that…he will predictably reply that he thinks (with excellent reasons!) that he was poorly treated.
So what? The way I look at it was that if some one asked me about guy I worked for 30 years ago, I will say I was ripped off…but I certainly haven’t lost any sleep in last thirty years thinking about my ex-boss.