Why does my husband keep saying things like that?

My husband usually does the grocery shopping. He called me this evening and asked what we were missing, so I told him to get eggs, mayonnaise, bread, and sausages. When he said he'd only get bread and that he already had the rest, I said no, I checked. He then let out a strange laugh and said, "You can only eat these when I'm the only me home."
Why does my husband keep saying things like that?
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