I do, in theory. But I am not often arsed to put the theory into specific practice. I am by far not an expert in the language.
What he wants to say is... I'm better at his own language... 
Well, no one's born with an accent anyway.
Nope, didn't get it. Ugh. It WAS a crap explanation. What I mean is... every accent has an area where it's... local. RP doesn't have such a thing. By being "born" with an accent, what I really meant was more like... you're born in an area, and you're likely to live in that area, at least the first few years of your life. Which, of course, means that you pick up the "local" accent of the area you were born in.
I might be decent at English, but my explanations sure suck a big fat hairy one.