I'm not sure any annoyance is justified to be honest.
What he said about United is exactly what Pep has said whenever asked for the last 7 years. Why would anyone think Walker would break ranks and say something else?
I don't think he's avoiding responsibility, he's just a 33 year old who's seen this entire circus before. He was there at Christmas 2020 when half the forum wanted Pep fired because we were 8th, and he was there lifting the tophy in May. He was there when we were 2 goals down against Villa and lifted the trophy an hour later. He's seen the fans and media turn on this side a dozen sides and then have to walk it back a few weeks later.
He's seen the football machine want him replaced with Danilo, Cancelo, Stones, Akanji, Rico at City and TAA and Trippier and James for England and he just puts his head down and in a month or a years time the managers are picking him for every game still.
You could easily claim the interview shows he's not phased by criticism and he's an experience winner not panicking about City's position in the season if you wanted to, some of the attempted inferences into his inner psyche in this thread are absurd, and all of the abuse he's getting for poor form when there's 10 players just as out of form as him would suggest he's actually got a point.