How can I say when someone is sitting in my seat
In one episode of "house of cards" the main character says " Excuse me, I do believe you're sitting in my chair"
Do you think it's a rude sentence? When someone is sitting in my seat on the train I usually says: Excuse me, Is this xxx seat? I think is my seat. Can I seat,please?
But they usually looks at me strange so I'm not sure if my sentence is correct and it would be better use Frank Underwood sentence next time.

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Answer

I've never seen this television show before, but I guessed correctly that this character is a Southerner. This style of speaking is somewhat cultural. I also live in the South.

This may or not be rude. It does sounds a little forward though. Yes.

But if you wanted to change it, then it would be more polite to also ask for the seat. We would say something such as "Do you mind?", "May I have it back?", or something similar to that. But even these could be rude in some contexts and depending on the tone of voice and body language.

But the most grammatically direct way to say this would be to say close to this:

"I think that you are sitting in my chair. I was here before (or add whatever details that you have to explain why it is your seat). May I sit here?"

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