They put their phone on the table.
They’re rude to the waiter.
They don’t ask any questions about you or relay questions back to your questions.
Furthermore, instead of actually listening when you speak they only look like they’re waiting to respond with something they want to say about themselves.
They talk about their ex in a bad way.
They can’t stop looking at their phone (with no excuse).
Almost everything they say is negative.
You can’t put your finger on exactly why you just sense they’re secretly a jerk.