Grandad I think it's no secret that you do look for perceived insults to men whilst you have been a poster on GN, but I can't help feeling you blur the lines between personal gripes and as you have previously drawn our attention to, out and out "misandry".
I imagine the ratio of women posting on this site is far greater than men, how that ratio is broken down one can only guess at. but I think it's pretty safe to assume women outweigh male posters and as such we are the ones who tend to drive the talking points along on, if it were a site weighted the other way, then possibly the family relationship type of post might be skewed from a male perspective.
Quite honestly there are an awful lot of discussions about family dynamics per se, not just about male spouses, I'd say from the time I've been on here since 2011, I think the predominant discussions about inter family relationships relate to children/grandchildren rather than problems with husbands/male partners. Not getting along or changes in any relationships are issues that affect our lives and some people feel the need to post about problems they are facing, quite often for moral support.
I have an excellent husband, I'm lucky, I've no complaints, he has all the qualities I admire in a human being. However, if I were to describe my late father, the one word I'd use would be "irascible" not because he was male, but because simply that was always a facet of his personality and as such, and taking into account multiple health issues, yes as he aged he turned into a grumpy old man. Being grumpy can pertain to either sex, like a lot of other personality traits they are just part and parcel of the human condition imo. and as you say our individual aging process can be affected by umpteen variables.
For what it's worth I do think "misandry" exists, a while ago there seemed to be a spate of ads. where men were portrayed in a less than favourable light. As the mother of sons, I didn't like it, my impression was that there was some sort of misplaced raison d'etre to balance things up somehow in showing men up as fools. I think I'm also correct in saying that those ads didn't go down very well and received a fair number of complaints.
I think you have to make a distinction between moans about an individual, just because those observations happen to be about a husband it could just as well be another member of the family, it's the frustrations of everyday life the poster is sounding off about an issue that is pertinent to her life.