They get better after the war, at least in their narration. The United States reels shot in the ol' South also fit your criticism. Mostly Caucasians shown, although Glimpses of Florida includes an... ahem, interesting... moment involving "Swanee River". Note too that he directed a studio made short on Stephen Foster called Memories And Melodies showing happy plantation life that you must watch tongue and cheek.
This is just my perspective after listening to him over the years.
Jimmy is Mister Sunshine. He only sees The Good in every country. You never see soldiers marching in Imperial Japan, but he views the Japanese as "much like us". He fortunately made it to Austria before all of the Third Reich flags were put up in 1938. I think he was the personalty type who was happy with the progression of civil rights since his portraits of many Asian and tropical countries do present the residents as human. He is even quite optimistic of the darker skinned residents of Haiti.
His only fault may be that he was TOO easy going with the assumption that progress should be gradual or, at least, fit with what is wonderful about Western Civilization. I don't see him as the type marching with Martin Luther King, but probably applauding him from the side line in his white pants and travel hat. (Sort of like Miss Daisy as Hoke rolls his eyes in Driving Miss Daisy... but even that old broad still progressed in her old age.) Yeah... he is "old school", but I would not say he was necessarily Imperial and Euro-centered entirely.
I noticed that he has a live and let live attitude towards religions, but still loves that Mormon Tabernacle Choir. Elvis Presley was like that. Open to all faiths and not prejudiced about lifestyles, but still a bit too deep in the Spirit compared to others.
However, he DID shoot an awful huge number of reels in UK right after the war as if that nation is somehow the most important.