Of course all JWs aren't the same, but it happens that Boything's family are the particular hardcore fundie flavour of JW that everybody dislikes, including other JWs. Boything grew up going to 'meetings' four times a week for three or more hours at a go, weekend-long conventions of nothing but endless sermons, being forbidden from access to any non-church-approved reading or media of any type, and being told that his own dad is a demon because he's a magician. Their entire community and family are like that. These JWs do exist and they are indeed grand masters of the SHUUUUUUNNNN THE NONBELIEVER stuff. I have no idea how prevalent they are but going by what I've seen and read (and what Boything's dad has talked about, and he looooves talking about hwo ridiculous that shit is), they're certainly not UNUSUAL. They even have their own child sex abuse scandals. It seems far more common for them to SHUUUUNNNN THE NONBELIIIIIEVERRRRRR than it is for them to be a-okay with someone being ANY other flavour of belief, let alone ATHEIST.
It doesn't help that the people involved are more or less without exception terrible human beings. I can count on one hand the number of people who didn't say nasty things and/or shun us: Erin, their brother Ollie, Dad, and a friend of the bride's called Rachel who is just good fun to be around.
These sorts of things happen at fundie weddings of any kind though if you aren't a member of their club. Shitty people in combination with fundie beliefs makes for a wedding that's essentially a self-parody of intolerance.
Also, I TOTALLY should have brought you, Ibbs!!! That would have been great. All the middle-aged women in attendance would have spontaneously generated pearls just to clutch at them.