sorehead

One who is easily offended, annoyed, or angered.

One whose head is sore.

An irritable, discontented person; one who has a real or fancied grievance; in political use, a person who is dissatisfied through lack of recognition or reward for party services.

Same as bird-pox.

One who is disgruntled by a failure in politics, or the like.

A person who has a tendency to be angry or to feel offended.

someone who is peevish or disgruntled