While many people have commented on how much better it is here on Mastodon than it is on the birdsite, you should be aware that minorities (LGBTQ+, BIPOC, Jews) have been the targets of abuse here.
Also, trolls have started to set up instances to attack scientists, for example: @ct_bergstrom@fediscience.org.
Let's not kid ourselves; we are in a (relative) honeymoon period before the assholes show up. Yes, we have tools to deal with them (muting, blocking, even defederation), but we need to do more.