Right. Which is why the OP is looking for ways to address it. Just because she wants to do it in a civil way it doesn't mean she doesn't find it objectionable.
Except she has tried being civil hasn't she? Well, I assume she has as she said she has told him he smells before. If she has told him he has a problem and she would like it if he washes more and uses deodorant and he hasn't changed his ways then bluntness it has to be. Of course she finds it objectionable, she wouldn't have posted if she didn't.
FWIW (and at risk of harping on about it), surely smoking is much more disrespectful than having BO - it smells, compromises the health of the entire household, and risks leaving your spouse a full-time carer for you or an early widow. That's pretty selfish/disrespectful. Ditto having an unhealthy diet if you end up with diabetes. But if someone posted a thread going "How can I make my DH stop smoking / stop eating cakes?" it wouldn't generate the same level of shock and disgust that this thread has. (Or if it did, it would be directed at the OP for being controlling, not at her DH.) So it's not totally about respect, is it?
Smoking can be disrespectful yes. But again, I would imagine that anyone who thinks that way about smoking wouldn't marry a smoker?
I would have no issues with someone posting a thread asking how to deal with a husband who is eating so badly he is at risk of leaving her a widow much sooner than she should be.
Different people post on different threads as you know. You don't know how anyone who has posted here would respond to your other hypothetical posts.
I do see a slight difference between smoking and eating crap though. Smoking is an addiction. Eating crap might or might not be another form of an addiction and these things are often much harder to give up. It's not comparable to just jumping in the shower and having a quick wash and sticking on some roll on. If there is severe depression at play and his lack of hygiene is related to that I wouldn't suggest bluntness obviously. But what we have here is a man who is just too lazy to wash as much as he needs to and put on deodorant because he simply doesn't like it. He takes umbrage when OP tells him he needs to shower after exercise. I think the time for doing nicely nicely has long gone.