Do you think your annoyance and anger at their suggestion is a "real problem" or a "snowflake problem"? If you don't think it matters that much if someone says "man year" or "person year" (you said it wasn't a "real problem"), why is the suggestion to do either way so triggering to you? Do you think it might be more in line with how worthy of your annoyance it is to see someone suggest "person year" (maybe not worth that much annoyance in the grand scheme of thing when we have 'real problems'?) to reflect on your own about why their suggestion to say "person year" made you so angry and upset, without needing to reply on HN and turn it into a crusade?
If left alone, there would have been nothing distracting about that short and explicitly non-accusatory comment, but you were triggered and chose to build a crusade around how you don't want to see certain kinds of comments on HN. You seem to have trouble handling the fact that some people have different opinions than you, about what comments are worth making. Very snowflake problem.
Was it worth it? Did you feel good about yourself, to distract everyone like this?
The good news is when people start being more inclusive with their language you'll see fewer people correcting them!
Losing your job is a temporary problem for most people. Sexism, like the kind that is baked right into our language, is an inescapable daily struggle for many women.
We have the capacity to think about both women's rights and the recently unemployed at the same time. It's frankly sad that you can't look deeply enough at this issue to see it as more than a problem of "grammar preferences".