You can't tell them no, at least not without being a jerk.
When I was a young skate-rat, we would be out in the hot sun all day and we'd stop periodically at convenience stores to rehydrate. I always bought grapefruit juice. I like grapefruit juice, but that's not really why I bought it. I bought it because nobody else ever wanted any, so I didn't have to worry about someone asking for a sip and drinking half the bottle, I didn't have to worry about shared germs, etc. Nobody else liked grapefruit juice.
The moral of the story is, get yourself an uncommon user interface and an unfamiliar alternative browser. Shrug and say "do you know how to use Galeon on Afterstep" or the like, and you'll probably get a lot of intimidated demurrals.