I'm so sorry this has happened to you, I see it as well, I've got a disability, not one which means I can't work, however it is hard and sometimes can be quite depressing.
My child is severely learning disabled and again, I find it hard when seeing the challenges and those who use it as a "group" to co-opt. It is insulting to those who live it each day.
To go back to the thread; the Christmas card was fine, it wasn't the least bit offensive and Sophie Molly needs to get a grip. But he won't as he's a narcissist and a really disturbed one at that, going by all the previous threads I've read about this individual. It's a shame Sainsbury's backed down they should have told them to back off.