It depends a lot on what you consider "toxic".
If it's just about intrusive off-topic political discussion, then I fully agree with you: it's far more common in Lemmy than in Reddit, and sometimes it reaches a point that even people who'd otherwise enjoy discussing politics roll their eyes and say "not this shit again".
However, if "toxic" includes other forms of undesirable behaviour, then Lemmy is probably less toxic than Reddit. For example: while sometimes you do see here disingenuous and deliberate stupidity, "waah TL;DR!!", the "I don't understand" conveying disagreement, or passive aggressiveness, in Reddit they pop up all the time.
So, what do you consider toxic? Depending on that, the other users' experiences might be really similar or really different from yours.
That hints me that what people here is calling "toxic" is politics-related, since I'm a lemmy.ml user and I certainly would not say that my experience here is overall "toxic".
And, funnily enough, most of the issues that I had were with users from either lemmy.world or sh.itjust.works; sometimes lemm.ee.