I'm not a teacher, but I have worked with the general public so I do know some people can be quite entitled with their requests and they're not always rooted in reality, however, you say it's beyond a joke.
Most of the examples you've given are basically universal design teaching strategies: visual timetables, breaking instructions into manageable chunks, predictable routines, movement/brain breaks, reducing unnecessary sensory distraction, etc. A strategy being developed because it particularly helps disabled children doesn't mean it somehow becomes inappropriate when nondisabled children benefit from it too.
I still largely believe this is a political issue. The 1997 excellence for all children: meeting special educational needs paper made inclusion a central policy objective and argued that SEN children should be educated successfully in mainstream schools. Then in 2001 there was the SENDA as well as the revised SEN code of practice which gave the aforementioned paper more legal force. I know this was 25 years ago but what I think we're seeing is the butterfly effect in action.
In 2004 there was the Removing Barriers to Achievement: The Government's Strategy for SEN where they rather incorrectly assumed that the number of children requiring a SEND school placement should fall, and eventually the start of the snowballing of specialist schools being closed.
To now, we're seeing specialist schools still closing or purpose built schools being funded and sitting empty for years. An abundance of schools built for specific primary needs and not enough of other specific primary need schools being built all the while active specialist provisions being filled to the brim, meanwhile we bicker amongst ourselves about whether these children deserve the funding, whether the money would be better spent elsewhere, whether it can be afforded at all meanwhile the same children are struggling and disrupting the status quo in a previously homogeneous group of individual pupils.
It's sad all round. It shouldn't be this hard for our children to be able to access a reasonable education for their age, aptitude and wellbeing and the burden for providing this shouldn't be placed on the shoulders of mainstream teachers.
p