to be angry/annoyed/vexed/cross/irritated with somebody; to get upset over something; to resent
To take offence at the slightest thing; To get upset very easily; To get upset over the slightest thing
Come on now, there's nothing to be upset about
She was vexed at his behaviour
She was vexed to discover that she had left her purse behind
After waiting in vain, he left with some annoyance/in vexation
I know you resent my being here