Cancers are sensitive despite their harsh demeanor. They think through events with their own feelings rather than empathizing with others.
Scorpios act on their emotions, therefore a hurt Scorpio won't understand. Scorpio is most reasonable when a circumstance doesn't affect them, but they don't care.
Capricorns are neither emotional nor understanding. Their absence of emotion makes it hard to relate with others.
Leo can be the greatest or least understanding person you've ever met. Their reaction generally relies on how near you are to them.
If Aries feels wrong, you may not understand them. Out of spite, Aries will not be understanding.