I wouldn't say beat so much anymore, though that used to be the case. It still is to an extent in the acting profession, in that you're taught to perform in that accent, though that's changing too.

More like the accent just gets you made fun of or alienated, and you begin to pick up the RP accents because you're constantly surrounded by it. You never know though, although you'll pick up bits, there's a level of autonomy in linguistic convergence and divergence, that's sometimes very subconscious.