I'm going to take an educated guess that Arby's is an an At-Will employer. Something I'm sure, Republicans love, over unionization.
https://en.wikipedia.org/wiki/At-will_employment
I'm also betting if these Arby's employees refused to provide services to an IRS agent that Republicans by and large would be celebrating the employees decision.
Why?
Because the IRS is viewed by Republicans as going against Republicans trying to enrich themselves. And going against upper-income whites including those in the well-off suburbs.
Whereas "police" are viewed as the modern former on plantation enforcers keeping blacks and Latinos "in line" while also protecting whites and those in the well-off suburbs from them.
The IRS doesn't go around beating up and gunning to death rich Republicans anywhere near like how cops beat up and gun down working class and impoverished minorities. Yet, if you'd listen to the Republicans version of the IRS the rich whites are the most abused people on planet earth by a tyrannical IRS and "Government."