A few thoughts, for what it’s worth.
I think part of the problem is, you engaged with him. You fed the troll, so to speak.
I know it’s frustrating. I was looking at the given object, and I can see it almost drops your rating below 4 on that print profile. It’s not the best review, and I think you have a valid argument to have it taken off, but at the same time, I think you soiled yourself when you responded to that person the way you did.
My thought is you should have just given a simple response of “sorry it didn’t work out for you. It’s been working for me with the magnets I listed in the description”, or something of the sort. Just factual, and reaffirming that it’s working for you, or that certain variations of the model were done by request and may not perform fully as intended. Then, reported the review and move on.
Certainly the second review of not your model can be reported, haha.
My point is, sometimes you just gotta take the hit. Fighting it, especially arguing with people, can just make it worse and cause you more stress. It gives you less of a leg to stand on too when you engage with people in a more defensive stance.
When others stumble across that review and the responses too, it isn’t going to look super great for you. If you gave a short factual response, I think it would help direct people’s attention more towards the shortcomings of that person’s review rather than the argument between the two of you.
I know it’s all easier said than done and not as straight forward. I’ve argued with enough people online to get that, ha. I’ve also argued with enough people to realize the stress it causes and would advice others to try and avoid doing things that causes that stress to build.