Then you can worry about someone asking you to play a piece by Bach or Beethoven or the Beatles or White Snake or Deep Purple or Cesare Negri, instead of asking you to play a soprano, the person asking may not even know the different ukulele sizes but they may know their music.
That sounds to me a bit like someone handing me a guitar instead of a ukulele, but because that person knows their music, I should be able to perform anyway, because they didn't know the difference. (Some of you could do that, and at least play the top 4 strings to make it work.) Maybe I'm misunderstanding what you're saying.
If the person doesn't know about different sizes of ukuleles, (quite possible, I agree), I could tell them a bit about the differences in sizes, necks, and so on, and by then, they'd be bored and move on to something else, and I wouldn't have to play the wrong sized (for me) ukulele. LOL. But, if they are interested in ukulele at all, (could be, if they had one handy like that), maybe they would actually like to learn a little more about ukulele, if they didn't know about different sizes, and so on. Or maybe they do know about the different sizes, but that's all they had handy. Maybe they could play for me instead.
If they asked me to play something like White Snake or Deep Purple, I'd have to borrow David Bromberg's line: "I take requests. I just don't play them."
Unless we're professional ukulele players, I don't think we need to expand our musical repertoire to cover anything that we ourselves don't feel like learning for our hobby. If I was going to play for someone, (not likely, in my case), they'd have to either put up with the music that has interested me, or decide that they don't want to hear me play ukulele after all. After all, it's just a hobby for me, (one I really enjoy), and we can (hopefully) find common ground with something else, (maybe their hobby), if they're not interested in my hobby.