Was I in the wrong for not being more attentive after bumping a truck with my car door?

Today at a parking lot I went to get in my car and when opening the door bumped the pickup next to me. I noticed there was no ding, and started backing out. The guy had been sitting in the truck, flew out the door and started yelling, accusing me of hit and run. I told him there was nothing to do as there was no damage, and drove off.
The guy was overreacting and being an asshole
You were the asshole. You should have - done what exactly?
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Was I in the wrong for not being more attentive after bumping a truck with my car door?
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