If you are a first generation immigrant, who mastered English from scratch, I have nothing more to say.
Seek first to understand, then to be understood.
N.B: I know Americans who live in their own cultural bubble when overseas and do not take the initiative to engage with the local community.
Do the locals complain? No.
In business, I have never heard of the ridiculous concept of customers adapting to merchants, only the other way round.
Choosing to ignore a potentially money-making market will only be to your disadvantage.
+ the easiest person to change is yourself - go and learn some basic Spanish/Russian/Chinese.