Ok, I'll bite.

in what world is a comment making a joke about how this sweater would make a good gift for someone who's nursing objectification/sexist/misogynistic...?

I never said making a joke like that is any of those things. In fact, I explicitly said I didn't think they had malicious intent. I said I'm sick of reading people talk about women's bodies. I said it adds to an undercurrent of those things. If there was no underlying misogyny maybe it wouldn't be so bothersome to see talk about random women's bodies, but we are where we are. If you're going to bother commenting instead of just downvoting and moving on, please at least read my comment.

Getting a friend a nursing bra is a normal thing to do

Maybe we live in very different places, but this is not in my experience a normal thing to do. Maybe a gift card to a store that sells them, but generally most people don't know their friends maternity bra size, and even if they did, all manufacturers are slightly different regarding size and comfort and people would have to know the exact fit and clasp style they would want. I don't know you. Maybe you are surrounded by a bunch of pregnant women and have bought them all nursing bras, but this does not seem like a statement someone familiar with women, pregnant women, or bras in general would make.

You don't know OP nor their relationship with their coworkers.

You're right, I don't know their relationship, but I wasn't commenting on it here. I said that reading about someone doing that to a coworker is gross to me. It's maybe not gross to you, or their coworker, but I did not say anything about how their particular coworker would feel about it here. Again, please read the comment you're responding to.

downvoted into oblivion on probably the most progressive online community I've ever participated in

That says more about you and less about me than you're implying. A meme community on a site that's 80% men, sure sounds like a bastion of progressivism to me. Please see this fun comment chain from right here in this safe space of peace and love where someone just responds to me with sexual harassment, admits to knowing it was sexual harassment and then just doubles down only to have their comments upvoted: https://lemmy.world/comment/26712143

I legitimately do not care about about upvotes or downvotes, but if I were to, I would note that I do have a few upvotes but not one comment in agreement. Geez, I wonder why no one would want to comment. Would it be because publicly stating these opinions gets you publicly and privately harassed? Would it be because it's safer to stay silent?

The weirdest thing to me is that there is a button conveniently located right next to my username that people could use as a disagree button, but plenty have instead decided to spend their time writing comments that don't even attempt to address my point and just have been rude or hateful.

Based on most of the comments and messages, I'm guessing that the majority of people responding are men. I'm guessing, and sincerely hoping, that it's mostly young men. I shared my opinion as a woman that seeing people talk about women's bodies online has been othering. No one wanted to engage with that, much less hear it, and that's their and your prerogative, but I commented it because I felt someone should say something. Every response I have received has basically solidified that sentiment. People need to speak up because if not then you end up at a place where "progressives" see explicit sexual harassment as a fun retort to a woman expressing an opinion they don't like online. A somewhat low stakes opinion too, if I may add. I don't think I'm the first person to suggest not to make comments about other people's appearance, and it's not like I suggested slaughtering puppies. I just said I don't like when X and a lot of people seem to have taken that quite personally. To the extent they needed to comment "defending" their right to do that. I just wanted to shed some insight into my perspective. If you disagree or aren't interested in it, that's fine. You can downvote or block or send hate. Do what you need to do. I just hope I got at least one person to do some self reflection, even if their takeaway really was that I'm "off base."