Agreed, while it wasn't exactly constrained, I don't think that the first reaction should be to try and ostracize, then push out anyone who doesn't conform to social norms. Even if someone else is acting childish, it's up to you to be better, to be an adult and adopt and deal with that situation as a grown up.
That said, were there no conflicts with ES5 and say prototype.js? As far as I'm concerned, mootools shouldn't stop the use of the original name. I said as much in the discussion thread on GH.