You don't hate Levi. In fact you find him courageous and very impressive, but that doesn't change how he holds his tea cups. How he talks to himself. How he always looks like he hasn't had a minute of sleep. How he's so...easy to make fun of.
It's just harmless banter. Alone at the dining hall together because everyone else has retreated to their barracks. You have your jawline held in your palms, watching him as he drinks tea too close for comfort. He isn't trying to notice you, but it's hard when you're right there. "You hold your cup so weird." You snicker, commenting with a wrinkled nose.
He looks honestly concerned, as if nobody else has commented on his way of drinking or anything. Like you're crazy for even acknowledging it. "..why are you watching me drink?" He asks disgustedly, wrinkling his nose back.