No flames, but I just dont get this argument. I don't think using an umbrella in the rain is foolish or rude, I mean that IS what they are made for. When it rains, I expect umbrellas to be used by some people
That is like saying using an ECV or a stroller in a crowded park is foolish and rude. Sure there are some people who will plow into you, or run over your feet, just like there may be people who run around with their umbrellas poking people in the eye. I guess I would see
that person as rude, not the act of using whatever it is they are using (that isnt against any rules BTW).