Probably not simply because we are human, but we can minimize some of it.
You wouldn't screen out a person who cannot speak or who cannot speak clearly due to a disability of some sort. You'd use a different method of communication as would everyone else and it could really be the same for them.
On the other hand, if communication was clearly impossible and/or they needed to be understood by the public (customers), the accent may very well mean they cannot do the job and not in the scope of things to teach someone like you can teach expectations about customer service.
You wouldn't screen out a person who cannot speak or who cannot speak clearly due to a disability of some sort. You'd use a different method of communication as would everyone else and it could really be the same for them.
On the other hand, if communication was clearly impossible and/or they needed to be understood by the public (customers), the accent may very well mean they cannot do the job and not in the scope of things to teach someone like you can teach expectations about customer service.