2. Pen clicking.

Loud or repetitive noises are the worst. Highly sensitive individuals are easily overstimulated by their environments, making those sounds extra frustrating, HSP researcher Elaine Aron previously told HuffPost.
3. Rudeness.

HSPs typically rank high in conscientiousness, according to Aron. But that means more than doling out a few “pleases” and “thank yous.” Sensitive individuals are more in-tune to when they may be inconveniencing someone ( so you’ll rarely see a HSP get on the subway before everyone has a chance to exit.) They also are more likely to notice when someone isn’t exhibiting good manners.