In many cultures, in the old days, traditions dictated that the bride and groom could only see each other for the first time at the wedding - and in fact, they had very few options. Especially considering that divorces in ancient times were not welcomed, or were generally prohibited per se.
Today the situation is completely different - and each of us, when choosing a partner to date, is guided by some of our own criteria regarding appearance, behavior or everyday habits. Criteria, or prejudices - depending on how you look at it. And so, in this viral thread in the AskWomen community, women (and, I guess, men as well) answer the question: “What is the pettiest reason you won’t date anyone?”
More info: Reddit