You're projecting your views on the comment. You may even be correct, but it's still a projection: that view is not explicit in the text; combined with the specific wording, I feel down-voting rather than engaging was precisely the correct response.

This whole interaction is a classic motte-and-bailey: someone says something vague that can be interpreted several ways (and reading their comment history makes it clear what their intended emotional valence was); people respond to the subtext, and then someone jumps “woah woah, they never actually said that”.

Either way, nothing of value was lost, as the same point you say he was trying to make was made in several other comments which were not downvoted.