The short answer is no, under any circumstances.
Examiners are trained to prepare a test environment which gets the best out of the candidate. Most 'normal' candidates are their own best critics and are willing to admit any mistakes and willing to learn from the test experience, with a view to making a better fist of any further attempts.
On a very few occasions I have come across a candidate who tries to justify a mistake or lack of airmanship, but usually when it is explained that the test can only be a snapshot of the candidate's ability, and the mistake was made despite the pleas for mitigation, common sense prevails and any belligerence evaporates.
The reaction described points towards an unstable character trait which would not have a place in any cockpit.
As an examiner I toowould be inclined, in the circumstances described, to draw such behaviour to the attention of the Authority.
L400