"you alright, man? My mum said you'd been feeling a bit down and could use a talk."
British character on US TV:
"Cor blimey, guvnor! Me mam gave us a right old bollockin' on that you'd bin down in the dumps and could use a jolly ole shot in the arm! Roger roger! Say no more!"
British TV has to tone it down because British people get offended and think that the characters are just cartoonish stereotypes. Their US portrayal is more accurate because they don't have to tone it down.
Yep, completely right we all talk like that all day and don't notice. That's why we notice it sounds weird when we see people speaking completely normally in US shows.