One of our kids has motor tics and ocd behaviors. Some times they are worse than others. I so understand what you are saying. If you comment on them they get worse. Sometimes he can hold them in for a short time, then they are worse later. His are not vocal usually now but he has one right now that causes him to move his head, slam his jaw shut and then move his arm. Who knows why? He held it in earlier today (dentist appt) and now they are really bad this evening. High stress/excitement can make them worse. I plan on asking for a DAS if they are this bad. I do worry about others but honestly I worry more about his comfort. His can get so bad he can't eat and he could injure himself if he slams his head back. Waiting somewhere in as quiet place as we can would help. Hopefully though they will go away (they have before). Every kid is different, even with the same diagnosis. I'm sure you already make plans for shorter times in the park and plan fp for the impt things (guessing but that is what we do) If they say no, they say no and you fall back on plan B.