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As I said, I'm not interested in whos wrong and whos right, so I'm not going to stick around to bicker. I'm interested in interesting thoughts. Someone looking for proof of a mundane thing is great. Making claims and then rather than explaining your claims, trying to pick a fight is boring.
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Unfortunately notbatman isn't interested in anything but picking fights with those who don't share his/her views on the shape of the Earth.
You can try and engage him/her in an open discussion but as you've witnessed, you'll get ridiculed, abused, told to go kill yourself, ignored, have the conversation point changes mid discussion or any combination of the aforementioned.
As you've mentioned, the best thing attempting to have this discussion with notbatman is that you get to push your own understandings.