Yes, OP - this is most definitely a phenomenon with my teen boys too. They both look absolutely stricken if I so much as suggest an umbrella. Very occasionally, they'll wear a windbreaker type of lightweight jacket, which I guess acts somewhat like a rain jacket. But anything else - forget it.
My teen daughter is somewhat better, but not really. She wouldn't be caught dead carrying an umbrella, but she'll wear a rain jacket/windbreaker and probably duck boots when it gets colder. But only because they're in style.
