using that logic 

In an argument, it is exploiting someone's logic trail and using the exact same logic trail against them, often modified to use counterpart objects of comparison and/or contrast.
In regular conversations, it is often used as call to action.

Argumentative:
Man 1: One of the ideas explored sometimes was to take useful items and somehow corrupt them and make them unusable/impractical and pass it off as art. Anyways, this guy is about 100 years too late with this.
Man 2: Using that logic, we should all stop making art at all because we're all 41,000 years too late with it.
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She explains that it’s okay to call white people “crackers” because it’s a term slaves used to describe whites. So using that logic, she shouldn’t be offended if a racist white person calls her the “n” word. After all, that’s how the white slave owners referred to the slaves.

Conversational:
Batman gets his name from a fear of bats. Using that logic, what's your superhero name?

using that logic by O_H October 11, 2016