Are you referring to the syndrome where people say things outloud that they normally repress such as swear words? Unfortunately there are people out there who would mock someone with such a disability.
I don't think that someone suffering Tourette's Syndrome would inadvertantly mock other people. Certainly they would be able to offend someone, or perhaps even insult them, but I don't think mock is the right word.
With Tourette's, people suffer from involuntary movements and utterences. In rare and extreme cases, this actually causes people to swear loudly at random intervals, particularly when they are stressed. So certainly, for others nearby, this could be very offensive (and confusing!)
However, mocking implies a personal attack on someone - belittling and teasing someone. People suffering Tourette's do their actions at random, and certainly without any motive. So, it's not really possible that Tourette's can cause someone to mock someone else.