I really struggle with DH's lack of understanding (and hence apparent lack of caring) for DS2's disabilities/SNs. He gets cross, impatient, and gets crabby and shouty a LOT. He is dealing with depression, but FFS it's been well over two years now, he's had plenty of time to get his head around it. I had maybe ten minutes to get my head around it and then had to simply deal with it and move on, as I have too many things to take care of to dwell on one thing.
I went to a parent/carer's meeting the other day at DS2's SS, and lo and behold, it was all mums there, and quite a few stated their partners did not seem to understand or support the SNs of the child or the stresses/work of the carer parent. They overdisciplined and used methods repeatedly that had already been shown to be ineffective (and then complained about the fact that they were ineffective, even though they already KNEW it wouldn't work!). Even when specifically shown by the carer parent the best way to handle a situation, they still stubbornly repeated the previous ineffective method, and AGAIN got upset over the fact that it didn't work. 
Now, I really want to avoid being sexist here, as I know there are many many men that are wonderful carers for their children. But why is this so blasted commonplace?? If nothing else, wouldn't you think they'd opt for the most effective method, rather than tiredly repeating bad methods and then sulking about like a teenager and whinging about how much of a pain the child is? I mean, REALLY?!?!?!
Prime example... we just bought a Google nexus tablet. DH & I agreed yesterday that for now, it was only to come out when DS3 was in bed, so DS2 would have some time to use it in peace in the evening for a short period of time, without a 3yo trying to grab it from him. So what does DH do?? He brings it out afterschool today, with both boys sitting right there - they immediately start squabbling to use it, DH gets shouty and I had to tell him to just put it away. He is now sulking, DS2 had a monumental meltdown lasting literally 2 hours, and I had to deal with it. It could easily been avoided, but now DH is blaming me for it. WHY!?!?!?! I'm not the one that brought it out...
I didn't even set off DS2's meltdown and I'm the one that had to cope with it for 2 hrs - DH just snapped at him a couple times so I had to tell him to leave him alone if he couldn't be helpful. grrrrrrrrr
ok.... breathe..... nope, still feeling stabby.... grrrrrr