If someone claims “A implies B” but you want to rebut that “No, B implies A”, what is the rhetorical/latin/logical term for that?

This would be a subset of post hoc (I think…). But it’s distinct in that it rebuts specifically with, “No, but the converse is true.”

So to restate using a common example:

Claim: “If you take an umbrella outside, it will rain!”

Response: “That claim is . Rain causes you to get an umbrella.”