You confuse ANY-one and EVERY-one.
Actually, no. You are confusing the two.
The original question was, who uses a real email address to register anywhere?. (Rhetorically) implying that "EVERY-one" doesn't, or shouldn't, use their real identity on the Interwebs. I replied, pointing out that that's not the case - there are people that do, in fact, enter discussion with their real identiies.
I didn't claim (a) that "EVERY-one" does that, nor that (b) "EVERY-one" should do that, nor that (c) "EVERY-one" should be required to do that. I simply pointed out that (1) it's possible to do that, and (2) at least some people actually do that.
But you, apparently, think that if "ANY-one" does something, that automactially means "EVERY-one" should. To paraphrase Babbage, 'I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a conclusion'.