I admit I don’t get the point of telling people how to approach me either. Telling people how atheists think, though, is good. As for talking to Christians, many atheists came to their opinion through a logical process. I did. I find it fascinating to understand the thought processes of someone with an opposite view, and to be able to quiz them and get answers back. In my experience, most proselytizers are not very receptive to this approach, and would rather talk to someone who has not thought this stuff out. I don’t blame them; they are basically salesdroids, after all. I’m not going to wander into a church and ask these questions, but if someone comes up to me I will. If they can’t defend their product, screw them.
A noisy evangelical atheist isn’t going to be running for office in any scenario either. Though we did have a Baptist minister who was a governor running for president, didn’t we? I’m talking about atheists with the same level of commitment as Christians and Jews today; devout perhaps but not noisy. (Devout is a joke.)
When the Baptists came I said I was Jewish, and instead of them politely leaving I got a “you’ll burn in hellfire anyway” bit. So I turned on my outrage Jew shtick - we’ve been oppressed for 2,000 years by you people, Inquisition, Crusades, blah blah blah. I suspect they thought I was going to punch them out, Kinky Friedman style. They ran.
When the JWs came, I politely said, “sorry, this is a devout atheist household” and that was enough for them to run. No one has bothered me since. Polite but outrageous seems to do it.