Lemmy also seems to have a higher proportion of the following than other social media sites. (Mastodon has a lot of this too.)

1. Linux users.
2. Other open source software users.
3. Programmers for both of the above.

And, I'm sorry if this offends some, but genuinely the entire open source field is toxic AAF. Racism abounds in it, as does sexism.¹ Any community with an elevated proportion of these three categories of people is going to see commensurate elevated proportions of racism and sexism as well.

In Mastodon this has been a good test of the filters. In Lemmy ... well, Lemmy kind of sucks at all the protections functionality. ("Blocking" does no such thing, for example. It's more equivalent to Mastodon "muting" than it is blocking, and is Yet Another Channel For Abuse as a result.)

¹ Note: I'm not saying being a programmer, or Linux user, or whatnot makes you a bigot. I'm saying that the levels of bigotry in these communities are elevated from the mainstream, thus an increase in people from these communities means an increase from the baseline in the associated bigotries.