The higher-score comments there don't seem to be particularly hostile to Lemmy. They talk about legitimate concerns like whether Lemmy as it exists now could deal with a Reddit-size volume of data, The top comment at this time speaks favorably of !selfhosted@lemmy.world.

Of course people who are still using Reddit are more likely to view Reddit as favorable or acceptable and alternatives as problematic, or not quite there yet. I'm actively Fediverse-first in my use of social media, but I still end up on Reddit quite a bit for niche interests because that's where the most people are.