I can laugh about a lot of jokes made about me, my height, my build, etc, but it really depends on what the intent is. some people are just dumb, and if the jokes stop with one or two and it's obvious they just haven't thought it through, then I can shrugg it off.
The problem is when it is meant to put you in what ever place people think you should be in. I remember a doctor here who insisted on speaking with a fake American accent while I was trying to hold down my autistic child for an ear exam (he had an infection). I was swallowing my pride and trying to ignore it, but My son at one point sat stright up, gave the doctor a hideous look, one I had not seen on him earlier, and kicked the old coot in the fork. He kept insisting that he accent was a joke, and i let him say so, but It kept going past the point of funny and was condescending and childish. I was getting angry, and my son picked it up even if I couldn't say it. And who can blame a poor handicapped child? Now who's the joke on?