Oh, I'm exactly like this in real life.
If someone asks me for my preferences so they can use MY preferences to buy someone else a naughty gift, I will opt to tell them to go shopping with their partner for the toys. Because again, MY preferences unique to me. Going shopping together is fun, sexy and can help you learn what your partner likes.
Which, let's face it, you need. If you're asking a bunch of strangers on the net their preferences rather than going by what you know your partner likes, having a small sexy field trip to the sex store will be not only enjoyable but educational.