as I've never heard of the rule that states "thou must live in a grubby bedsit in London
Shades of grey rather than black and white, innit.
S'like people tend to see the hypocrisy of things like...being completely random here...but taking advantage of tax loop holes by changing your reisdency elsewhere, and flying you hat places first class....while bemoaning poverty and exhorting other people with far far less to make far far larger sacrifices in relative terms.
So BB in a ice home in a nice area, probably wouldn't get people's goats.
But a massive mansion, or an opulant (rather than merely quite comfortable) lifestyle stands in stark contrast with personal values stated.
Basically a message sounds like "do as I say, not do as I do" if you stick to talking the talk, but not walking the walk.
And that whiffs a little of hypocrisy, which doesn't inspire confidence.