Remove negative feedback?

I recently requested to cancel a trade with a shady user and got a negative feedback. The user is brand new and had several expensive cards listed. He traded those away, then relisted. This has happened multiple times all the while no trades have been marked as shipped, and he keeps offering the same cards in trades just re-adding them to his inventory after the trades are accepted.

I asked him if he'd sent, he said he was busy multiple times. I was worried he may be trying to scam people so I hit the dispute button, I didn't know he'd see it and be able to leave me negative feedback. Is it possible to have this removed? I will be sad if my reputation is marred because Im trying to protect mine and other people's property.