[chc]

All you really pointed out is that his legal name is not "anigbrowl." And all he argued that was legal names do have some special importance, and it's out of touch with societal norms to say they don't. The fact that his name isn't "anigbrowl" is irrelevant to the fact that legal names have some special importance — both of these facts can coexist at once.

The logical conclusion of anigbrowl's position is not "You will be permabanned from this service if you can't produce a driver license reading 'anigbrowl'." This is an argument against a much more ridiculous stance than the one he took.