I don't see how anyone can be offended by this. It's just a game sign and a joke.
I can tell a lot of people haven't had someone with a real disability in their lives because people with them make fun of themselves all the time, as humor been proven to be one of the best coping mechanisms time and time again. When my father was diagnosed terminal with his cancer he made more death and dark jokes than all of the people against Black Lives Matter.
We live in an age where people get offended far too easily (and it's really not the under 30 age group,) and I can all but guarantee Dobbs isn't offended by this. Don't be offended for him, as if it truly bothers you just come up with something funnier and move on. Because *****ing and complaining (especially on a message board) does absolutely nothing to further the conversation or make anything better.