I've only seen one thread which felt completely like Reddit. The community was for the alien comics, and the comics were taking a dig at imperial units vs metric units. Nothing wrong with that, it was all in good fun and jest.
The comments though were toxic frankly. If you said you liked both systems and provided reasons, you were buried in downvotes. If you discussed some upsides of the imperial system, you were ridiculed to be a child. Even if you were an engineer and you provided a lengthy explanation, it was met with derision. And then there were all the logically inconsistent arguments and the notion that Americans were simultaneously idiots but also apparently complete geniuses with how complex they made the imperial system out to be.
I'm thankful it was just the one thread. All of the politics threads I've viewed have been more civil and open to discussion (and I consume a fair bit of political news). Lemmy, until that thread, felt like a place where nuanced opinions and discussions were encouraged and upvoted. I hope it's just a one off.