Answer:
Horn effect
Step-by-step explanation:
Horn effect is a perception distortion that affects the way people interprets information about other's,due to one reason or the other. This is usually a type of immediate judgement discrepancy.
Judging the instructor by his sloppily appearance and untammed hair is actually a judgement discrepancy,because to you he is an unserious and unintelligent fellow. Whereby the reverse is the case here.