A little background first, I'm great at my job. Several times I've been offered a promotion by company higher ups but I like the niche that I fill and my hours are exactly the ones I see myself working for a long time to come so I've always refused. Now my supervisor is also very good at her job. So much so that the head of our department made sure to give her a bonus to keep her from transferring, and that's unheard of.

Anyway recently this supervisor who thinks she's hot shit will constantly make remarks about how poor my performance is, despite me being one of the most objectively productive people (if not the most productive) working. It's always said in a lighthearted almost joking way as she doesn't actually follow through with disciplinary action nor threaten any and she's usually grinning after saying it. So I'll just ignore it or say something like "You should fire me" and that'll be the end of it. These comments range from accusing me of messing up something that I didn't or she'll just tell new employees that they're better at the job than I am. She just won't stop as it's been months and it's starting to really frustrate me, despite being able to maintain frame and awareness of what she's doing. This shit is said so much that I've noticed coworkers subconsciously accepting it as fact. Looking for opinions