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You: "Look at these videos showing genocide in Gaza!"

Him: "Those videos are demonstrably fake."

You: "Doesn't matter!"

Are you sure that's the right fallacy?

This fake?

At no point did I ever point to a video and say that it shows genocide, so your first line is invented. Here's a more accurate version:

Him: "Here is some evidence that some videos have been faked" Me: "The fact that some have been faked doesn't mean there aren't real ones"

So yes, it's the right fallacy.