I think many peoples have awful attitudes to disabilities, especially mental health, so i think in many cases, they are genuine posters, i remember the fun poked at people negatively affected by Brexit, these people enjoyed the fact others were suffering.
I'll give you an example, a retired Policeman started up a dog kennels near me, a local man had lost is DD in an accident, this man made fun of the bereaved father to his face, taunted him over her death.
The child of the woman who drowned, had to change schools because of the bullying she experienced because she didn't have a mum & the school did SFA.
Some people lack all empathy and enjoy - trying to - make other people miserable.