First of all I want to thank everyone for their opinion and advise.
It's a real pleasure to have a forum like this to get honest opinions.

Second, the situation has since been resolved to everyone's
satisfaction..

My student continued the test the next day after I had a chance to
lightly question the DE. At first, I really didn't want to address
the issue about how dissatisfied the student was with the DE's
personality. However after chit chatting with the DE for a few I
‘discovered' that the DE was on his 3rd day of all day check rides and
was getting tired. Plus, it seems there was some miscommunication
between the student and DE during the exam that might have lead to a
misunderstanding and stress being placed on the student. However, on
the final day of the check ride (3 days in all, weather was a factor),
my student reported that the DE seems to be in a much better mood and
was actually pleasant to fly with. In the end, the student ended up
passing.

What I've learned? In the future I'm going to establish a better
relationship between myself the available DE's in my area. I take the
blame for not devoting more attention to this. With that said, I still
have some reservations about using this DE again. I understand that
some ‘stress' is normal, however if the DE is taking it several steps
further (due to his own fatigue or other factors), then I see that as
a problem.

One other factor I can now discuss is the DE's method of
distracting/testing (?) the student. Seems even if the student is
giving the DE a correct answer to a questions, the DE will look
disappointed and shake their head in a disapproving manner. I've
personally never heard of this tactic, but I think it's a poor method
to use during an exam.

So, thanks again for any comments.

Fly safe,