Oh dear , I know what you mean by that tendency to pick up accents !! I have suffered so much at the hands of this particular tendency 
I used to have a pure british accent for english , until i spent about 3 years in Pakistan and started losing it and then my best friend is american … and before I knew i was split between the two accents !!!
Last year, in dubai , I was coming back from AUH to dubai in a taxi … the driver was pathan .. we exchanged a few lines and that was enough for me to speak pathani urdu ! my mom freaked out !