Confrontations with a 4 Year Old

Statement: "I don't like you!"
Frequency: It feels like at least 10 times per day, becoming more frequent the past week
Face: Cheeks flushed, teeth clenched, often tears streaming
Cause: Anything I ask him to do that he doesn't want to.
My reaction: Heart palpitations, knot of anger in my stomach.
Improvement on my part: Raised voice not quite as often
More improvement needed: Complete non-reaction