How do you deal with a family member who responds condescendingly to normal questions?

A close family member of mine gets a tone and makes you feel stupid for everything you ask. The other day his cousin called him and left a message. The next day I asked if he called his cousin back and he answered with a condescending tone. First like. What? What could you possibly mean? Then I explained because they just called you and he answers with another tone.. why would I call them?

It's hard to express it over text, but basically a tone like you just asked the stupidest question when in reality it's a relavant, simple question to an event that just happened. There is no feelings or anything attached to this conversation that should warrant him acting. It was a basic neutral question.

He does this all the time to the point we have called him out on it as it's happening. He just plays dumb like he has no idea what you are talking about, but then does the same thing again next time. Nothing gets solved. Does anyone know anyone like this. How do you fix it?

How do you deal with a family member who responds condescendingly to normal questions?
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