The troll isn't labeled anti-social anymore which is a step in the right direction because:
1. A troll isn't necessarily anti-social.
2. Labeling someone anti-social is something better done by psychologists, or rather, not at all because I wouldn't know what would make someone anti-social.
3. The idea of sticking such a badge unto someone with an algorithm is unethical by itself.
Moreover, I adore a good troll. The vulgar argument is by itself often a good manner of shaking firm believes, an argument which invites reflection, and is (often) correct in a humorous manner.
Maybe someone has a particular itch, maybe someone is fed up, maybe someone is a juvenile, maybe someone just has a different opinion on a subject.
Creating a black-triangle algorithm* will result in death. Exclusion from a community can be harsh for juveniles, even if they were just trolling to receive some attention. The last straw which can end in suicide.
This could be the first example of (socially engineered) death by algorithm. Some things you just don't want to automate.
Sorry, Google, invent something better.