I watched the Scotrail Glasgow abrasivness video, and I don't think the staff treated the wheelchair user with any disrespect.
The wheelchair user was expecting a taxi to be waiting for him, and it wasn't there, for whatever reason. He needed to get to Glasgow Queen Street to get to Edinburgh, where he had a tight connection.
The platform staff were unaware of the fact that the wheelchair user was expecting a taxi to be waiting for him, and were attempting to find out what had gone wrong.
The wheelchair user was complaining that Andrew Marshall Roberts, the Head of Access and Inclusion at Scotrail, had personally arranged for a taxi to be waiting for him. I suspect that the task of actually organising the taxi was delegated to someone else, and for some reason the message didn't get through to the platform staff.
Of course, it isn't the wheelchair user's fault that the taxi wasn't waiting for him, but I do feel that he spent a lot of time arguing about why the taxi wasn't there, rather than trying to find the quickest way of getting to Queen Street. From my knowledge of Glasgow Central, the taxi rank in outside the front of the station in Gordon Street, and there is always a line of taxis there. I don't know if Glasgow taxis have a wheelchair ramp, but if they do, then surely the best way of resolving the situation would be to take the wheelchair user to the front of the station and put him in the next available taxi. If the delay caused him to miss his connection in Edinburgh, then he should be compensated, or have his ticket endorsed to take the next available train.
As to the other videos, I didn't watch any of them, but I don't doubt that they are true, and that wheelchair users face many difficulties when using public transport.
I wonder though whether these videos are typical of disabled users experience of using public transport, and whether there are thousands of journeys that are completed every week without a problem, that don't end up on You Tube.
For the record, I am disabled myself, although not in a wheelchair, and I can appreciate some of the difficulties that other disabled users face.