opinions about rejection

Ok guys hear me out, so let’s say you’re proposing or asking someone to be your partner right, but you are making this grande so its on a stage, at a busy fancy restaurant or whatever. Like for me whenever i see rejections like that i have this thought of why would anyone do that. Like obviously you guys have a solid relationship for the other partner to have the courage to ask that question, but if you’re going to reject it why embarrass them in that moment rather than go along and explain later on your rejection and why you feel that way.