NOT ADVICE: Way back, I used to take a coin from my pocket, toss it and then pick one. It stopped my getting asked in no time and occasionally started a lively discussion about not having a preference. But I didn’t notice at the time whether it also drove people away.
Today, I suggest to people facing a decision to choose A and live with the decision for an hour or two. Then choose B and live with it for a while. Your feelings during the experiment are the answer.