Chulenterrov,
It is normal for people to change the way they speak after immersing in another environment. I even knew someone who developed a Texas accent after moving to there from NY. For examples, English-speakers who live in Israel say “I’m going to the makkolet” rather than “I’m going to the grocery store”. Would you rather he learn nibbul peh?
I also do not understand why “do you mochel me” would be out of context. Are you the unforgiving type?