Thank you for compliments...
I live in a country where of the 50mil people 80% grew up with English as second language yet it's very broken. THis is fact, Asami is Japanese and have never learned or bothered to learn proper English. I am sorry if you feel it's wrong or dare i say a trope or racist, definitely not meant as either.
I based this on the Asians I do know and black/African people I do know so it's not in any form or shape trying to be as i said above. Apologies if it's something that bothers you a lot, but I am not going to change it anytime soon. Remember not all people or countries are the same.
ps. you have me stumped regarding the 15 yrs with them quote by Summer. Asami's been with the family in their house 5 yrs and 2yrs before that will be explained later. Let me check my notes on this as i am stumped too.