If once opened you don’t refrigerate ketchup you are risking food poisoning. There are no preservatives in ketchup and it will deteriorate quite quickly. There is no debate on this. If you’re happy to eat significantly deteriorating food then nobody can stop you but it needs to be refrigerated once open.
I've never refridgerated ketchup, it lasts months if not longer & no one in the household has ever been ill.
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