I don't think someone expressing a unsubstantiated negative opinion is akin to trolling

I would define trolling as a low-effort/sloppy attempt at a counterargumentation whose sole point is to ragebait you into looking unhinged in your response so that we can make fun of you

You never know what's going on in the mind of another person, they could have something going on that makes them feel negatively about qemu. We can project our stress into all kinds of strange places.