I think he would like his solo career recognised more, and it riles him that it isn't. That his best work is still considered to be with The Beatles, is maybe an annoyance to him, though he fuels this himself. He's the typical eclectic; he's never really had direction. He is sometimes his own worst enemy. I'd love to see him in an interview moaning about how he's been portrayed over the years, and going for some of the people that have picked holes in him. If he poured his heart out he might receive more sympathy.
If I was him it would really p*ss me off with all the adulation that Lennon has received since his death considering his mediocre solo output. It may be too late for him to do anything about it now, if he'd tried to set the record straight it would have had to have been while Lennon was still alive. And it can't help that Yoko constantly pushes Lennon's memory to new, undeserved heights.
It's a very strange position he finds himself in. Ex-Beatle, one of the richest men around, decorated songwriter, knight, and yet still derided in some quarters. Rightly or wrongly Lennon has been elevated to 'sainthood', and he just has to get on and accept that he came second.