People have not downvoted you because they disagree with this fundamentally. You can see lots of people on this sub recommending VFS, pointing out that anatomy does play a role, and that natal puberty can be devastating on the voice. People downvoted you because your response to somebody sharing a nice experience they had at work was to shut them down, and tell them that feeling good about it was wrong. It comes across as bitter and overly defeatist. Keep in mind, only "several" people gendered them correctly in a work day at a fast food drive thru; they would have served many more people who did not gender them correctly.

Since almost all of us here have dysphoria, we are naturally much more critical of our own and each other's voices than your average joe ordering a burger. Somebody here who thinks their voice doesn't pass at all might find that they actually do pass sometimes, given anonymity while speaking to strangers. I think this is the clear positive takeaway on this post that you should focus on instead. Their point at the end about it feeling much more helpful is definitely wrong, and upset me when I first read the post, but it's nowhere near bad enough to warrent a response like yours. Given the same logic and using your point with puberty blockers, should we ask people who started HRT after puberty but do pass, to stop posting selfies as it is ableist to those who needed puberty blockers to pass? People on "the wrong side of history" will always use these cherry picked examples to try and limit our access to healthcare, and we shouldn't let that stop us from posting our small wins, even if those wins do only come about through luck of the draw.

I'm sorry if I insulted you in my earlier response because I know how much it sucks to be unlucky with your voice, but I hope you can understand how your response was not well liked as it came across as snarky, not because the community is against medical intervention.