Everybody kept ignoring him but he didn't let it knock him down.
Is this a natural idiom to use in the context?
No. I've never heard that. You could say eg Everybody kept ignoring him but he didn't let it get him down .
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No. I've never heard that.
You could say eg Everybody kept ignoring him but he didn't let it get him down.
If something gets someone down, it depresses them.