Definitely this. Shame leading to blame. I suspect it would take years of decent therapy to unpick this.
It took H many years to fully accept and understand DD's diagnosis, although to be fair, he was always very supportive of making sure her needs were met at nursery or on holidays. Never questioned why I insisted on sunflower lanyards and Special Assistance at the airports (we've travelled a lot!). Yet, looking at potential ND in himself has taken a long time and he wasn't particularly supportive of me when I first went to the GP for a referral (attention seeking might have been what he described it as 'jokingly'). Now he is on the pathway to his own diagnosis and admits that he is very self-critical. There is a lot of internalised shame there. There is no excuse for the behaviour over the years, but I think I'm finally understanding it all a bit better.
Looking at myself I think I used to take the attitude that 'why can't people just be logical about stuff and less emotional', when younger, despite me likely being more led my emotions that I realised at the time. Maybe I shamed people for getting upset over what I probably deemed as not worthy getting upset about. Yet, if it was something that I could relate to, like loosing a pet, I would be totally supportive and understanding. Whereas if it was more practical, or in my opinion at the time, trivial, probably led to a less sympathetic response. I also never understood ambition and 'doing well' and probably just shrugged if someone got a higher grade, not in a mean way, just indifferent as couldn't see the point. Yet, to the person with the higher grade it might seem unkind. Which then led to me feeling shame for not being kind and supportive. So yes, I felt a lot of shame growing up and my coping mechanisms probably came across as me being indifferent or not caring. Possibly.
I'm trying to make up for it in the latter years, though, and found that I've been helpful in supporting and helping young people out of school for MH/ill health , in a previous job, as somehow can relate to and understand them. So some good has been 'put back' into the universe.