Is he dumb or a jerk or both? Should I leave him alone?

Anonymous
A guy I'm dating said he was recently diagnosed with prediabetes and asked me if I have any advice.

I told him to eat low carb and to avoid eating too much diary. I told him I saw research saying the bovine insulin in diary that is meant to promote the growth of baby cows has the same physiological function in humans as human insulin, and eating diary has been shown to increase the chances of insulin resistance.

Without skipping a beat, he immediately responded with a mocking tone: "So all the cows are walking around with diabetes?", like he doesn't believe me at all and he's 100% sure I'm wrong.
Is he dumb or a jerk or both? Should I leave him alone?
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