In class, I often work with students to remember that there is a difference between the way we speak and write and the way we do so at home. This seems to lessen a "critical" impact. I even use myself as an example. I have a strong Southern twang/drawl when I am around family and friends, but in the workplace (classroom) I use standard English.
I have also used Spanish when tutoring students as a lead in to English, getting them to understand the concepts first in Spanish, then leading them to explain the same concepts to me back in… >>>