TLDR WARNING: Not MMA related at all. It's about languages and accents. You might want to scroll past.
Right, I grew up in Detroit (not the safest city)
We spoke very differently in the neighborhood than I did at my suburban prep school.
Re Spanish: I learned most of it when I was living in Mexico DF; and San Juan PR.
Because of that my accent is a combination of the two and I've been told that I don't speak Spanish like an American (possibly because I learned the majority of my Spanish by living in Spanish speaking countries/territories); but
Re Non-Brits' English: There's a particular accent that is considered to be more "proper/correct" that people are taught that's typically only used by other Brits as an affectation. You know, that whole "boh-ul uh wah-uh" thing.
No one would speak like that in a formal interview/setting.
It's the same here in the states: The foreigners who I know that learned English in NYC always speak "Manhattan" not BK, Queens, etc...
Either that, or they sound like they came from NorCal, Oregon, or Washington.
Re Conor's English (And the Irish users might have a clarification): I believe that there's a south Dublin (?) accent that is supposed to be considered more posh or something.
I imagine when he gets upset he remembers that before being a multi-millionaire that he was plumber (or whatever.)
Serious question: If you were speaking on the the phone with someone from the south (GA, AL, etc...) would a bit of an accent slip out at some point in the conversation?