be disgusted at (someone or something)

To be appalled by or intensely disappointed with someone or something. I am totally disgusted at you for stealing money out of my purse. Why would you do something so sneaky? We are utterly disgusted at the actions of this company. They lied to our faces while continuing to dump toxic chemicals into our water supply. I'm very disgusted at my opponent—I've been trying to maintain a fair and respectable campaign, but he has no problem blatantly lying about me!