Some of the communities are fine, but make sure that you never EVER talk about politics in any way. And even then, why support such a place that has such a reputation? Most communities - though not all - have counterparts elsewhere. Judge for yourself, though it's nice to at least know that you have options:-).

In fairness, people outside of the instance may legit be receiving the brunt of their more extreme members coming out from the echo chamber and talking shit elsewhere. Then again, why choose to be inside that echo chamber, even if the toxicity is dialed way down?

And there are answers to that question that may depend on your circumstances: e.g. !Firefox@lemmy.ml is by far the largest Firefox community across the entire Fediverse. Also the ire of people inside Lemmy.ml is mostly directed at the primarily democratic capitalist Western society, but you may not feel impacted by such as much, as e.g. they make fun of the USA.

Only you know what will work best for you:-).