What is one thing about you that might instantly turn someone off?

I generally try not to offend people, but if I open my mouth, I never stop; I'm sharp-tongued and it can be hurtful. If I'm disgusted or hate something, even if I don't say it, my facial expression will give me away. I can't control my facial expressions 😒

What is one thing about you that might instantly turn someone off?
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