Do they KNOW that they aren't looking for an honest critique? Maybe, but sometimes I think you'd be surprised. I've known some actual GOOD photographers who produce a LOT of awesome work to the extent that they put me to shame. Yet despite being serious enough to get that good, they make mistakes like getting defensive about their work before anyone gets to see it, and making excuses whenever someone points out potential flaws.
My point being...learning how to talk about work is an acquired skill just as much as making work is. Knowing what you want from your work and what you want from your audience is an acquired skill. Most people don't know this stuff. Making good images is the easy part, and a lot of people get there without learning the other stuff. That doesn't NECESSARILY mean that they don't want to get better, that might just mean that they still really don't know what the hell they actually want.
And you can call people out on this during critiques. Again, not saying that you SHOULD. It's your time and you can do what you want to with it. I'm just saying that I strongly disagree with the assumption that someone's work isn't worth a critique if they get defensive in a title or suck at talking about photographs. Those things are also worthy of critique. Titling works, attitude towards works, and ability to discuss works are also important for people who make photographs, and it's valid to critique that stuff as well. I don't like to categorically dismiss people just because they suck at one area. I might categorically dismiss someone because I'm too LAZY to open the thread or comment on how their title isn't doing the image justice, but that's a different thing. That's me not feeling like telling someone that they screwed up. That's on me, it's not their fault for screwing up. If it was a certainty that they wouldn't screw up, then that would diminish much of the point of doing a critique in the first place.
I pretty much know when someone uses a title like, random shots of my friends done in a hurry in iffy light, CC please they are hoping for praise and not looking for critique. Because as soon as you point out a problem, they respond with "well I said it was done quickly in bad conditions." If it wasnt a serious effort why post in the first place, especially asking for critique? I suppose you will respond that I cant know, but I've enough experience with these posts to know the usual response.