I built my own system using both sentiment polarity analysis, hard-coded logic, and some semi-active tuning, but I'd rather not divulge specifics. IMO anyone can spin up their own similar system.

> I don't want certain types of users to know anything about me. I wouldn't have felt this way, say, 5 years back...

Frankly, most people DGAF about random HNers and (a general or meta-comment targeted at the reader, not you OP) if someone needs to use throwaways to post negatively polarized statements on HN, then they shouldn't even be on HN in the first place.