If it looks like a duck, walks like a duck, and swims like a duck, it’s probably a duck.
But that’s only because being a duck is a permanent condition: when you’re a duck, you’re a duck all the time.
The problem with extending that kind of inductive reasoning to non-permanent conditions, like being a liar, or a jerk, or an obstructionist is that it becomes a self fulfilling prophecy.
When you listen to someone as if they were one of those things, that’s how they continue to show up to you.
Even when they’re not.