Feo Takahari
Auror
We don't lack for harangues. I read dozens of them before I ever got involved in feminist stuff. What got me involved was one person who clearly and politely explained the problem and invited me to help.
You have to remember that just because you've given twenty people polite explanations doesn't mean the one you're currently arguing with has heard any of them. If you're polite and he's rude, you might as well move on to the next one. But if you're polite and he's polite, maybe he'll explain your position to the next person, and you won't have as many people to either explain to or harangue. (And what else can you do--hit him over the head with your protest sign?)
P.S. For what it's worth, this is also how I handle the anti-evolution crowd.
You have to remember that just because you've given twenty people polite explanations doesn't mean the one you're currently arguing with has heard any of them. If you're polite and he's rude, you might as well move on to the next one. But if you're polite and he's polite, maybe he'll explain your position to the next person, and you won't have as many people to either explain to or harangue. (And what else can you do--hit him over the head with your protest sign?)
P.S. For what it's worth, this is also how I handle the anti-evolution crowd.