Gosh actually that's awful. The people I know greatly helped by them are men and I'd not thought about the struggle if you're not only female but shorter than the average female. I can no longer stand without leverage and at home I have the perfect height window ledge and in public loos not being a wheelchair user don't use loos for the disabled and use the large circular toilet roll dispenser to help me up, thankfully so far they seem to be firmly fixed to the wal! Most local loos for the disabled around here would be large enough to accommodate two loos so they could be different heights.
I was at a venue today that have loos (gender free) with two loo cubicles but I noticed on the door of the toilet for the disabled it said Not all disabilities are visible and that's the first time I've ever seen that sign on a loo anywhere.
Today I was desperate for the toilet in London and the nearest public toilet was half a mile away, as if I could walked that, so I went into a little mini supermarket/newsagent and whipped out my registered disabled card and asked to use their staff loo. Thankfully though the lady looked wary and unsure told me where it was (through the stock room and in the back yard with no inside light switch so I had to leave the door ajar so I could see where the loo was) and when I went back through the shop and thanked the lady she asked me whether the loo was clean. I wasn't sure if she meant when I went to use it or how I had left it but the answer was yes anyway thank goodness. So glad I don't live in London. Very thankful for the kind lady, had I had a mind to I had the opportunity to steal a fair amount of stock as I had my rucksack with me. I'm always touched and grateful when someone helps me.