I have to agree with
@Suzetig ^^^^^
If you want to be "nicer" towards him, stop saying not very nice things about him here when you know he is a member and that he may therefore come across it.
I'm not making any judgments about who is "right" or 'wrong" out of the pair of you. Or whether he is nice or not nice. Or whether or not you are justified in feeling frustrated with him. Or whatever.
What I'm meaning is (and I know I wrote this on your other thread, so apologies for repeating myself!), whatever is going on in your relationship/dynamic, I strongly feel that you will both be much, much better off having these conversations yourselves (in private or with a couple's therapist) than with playing these things out on a public forum and asking strangers what they think when your husband can come along and see what you're writing about him.
If my partner joined here and I saw her posting things about me and what a nightmare I am and how I'm really annoying her at the moment and how she doesn't know if I'm a good person or not and why won't I ever do anything on my own or make a decision about something etc etc...and she then asks random strangers what they think and then I see all these people wading in to give their view on me and what my partner could do about me – and all this is happening with my partner knowing full well that I too am a member here and I can see all this (mainly negative) stuff she's saying about me...I'm pretty certain I'd feel furious, hurt, betrayed, let down...and I would be so baffled as to why she has chosen to take that action, air my/our dirty laundry in public and involve internet strangers in my life/our relationship when I am right there in real life to talk to! It would be harmful to our relationship – it wouldn't help to fix or improve anything.
Yes, plenty of people write about relationship stuff here – share examples of things going on, ask for advice and insight etc. But the huge difference to my mind is that the people they're writing about aren't going to stumble across it and be able to identify themselves (or their partner) in the posts. I don't see how doing that can ultimately do your relationship with your husband any good at all.
I don't think it matters that your intention in encouraging him to join was to for him to understand PTSD better and to get some support himself (ie not to read your posts). Or that you don't think he comes here very often. Or that you don't think he reads your posts often. He knows your username here so knows "who you are" here. Everything you write here is accessible to him. Anything you write about him here he can immediately identify it as being about him. And actually, you don't necessarily know how often he does actually come here or how much of you he is actually reading. You might think it's very little. It could be a whole lot more than you're assuming/than he's telling you.
I guess the other thing that comes to mind with your question about how to be nicer and more caring towards him....have you actually asked him how he would like you to do this? Has he pointed out things that he thinks are not nice/unkind/uncaring? If so, have you asked him what would have made him feel more cared for instead?
I don't mean to sound rude but I actually don't think the question of how to be nicer to someone in this context is rocket science. As someone else has already said in this thread, if you can identify that you are not being very nice/caring towards him, you must have an awareness of what you're doing that isn't very nice/kind/caring and you therefore have the awareness and ability to flip things around and do something differently.
You are, of course, free to write about anyone/anything you like here – just as we all are (well, within the policies/rules of the site!)
But you surely cannot expect that writing negative things about your husband when he can read them is going to improve things between the two of you?