Can you talk with British accent if you want?
Certainly, though I would have difficulty reproducing different regions beyond, broadly, northerner, southerner, and cockney. If we aren't getting into the weeds on the matter and you just want any English accent, it's not very difficult to do.
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As a response to your update, I would say that both of them have an attitude and a pride towards their accent. As both of them have English as their native language, some sort of ego/pride/attitude is understandable.As far as liking goes, I think the preference changes according to the person.