He's trying to be different by doing it. See that would work elsewhere but here everyone's already at everyone else' throats due to superiority complex clashes, he'll get to fight all the egotistical idiots on here if he does anything implying superiority or a future reasoning of superiority.
Although in the grand scheme of things he's exactly like you guys which defeats his purpose of being "different" by post signing, but nothing here has ever been
Kantian for that matter so what'ch you gonna do. If he wanted to be different he would do something constructive instead of bickering on the internet about stupid stuff no one should care about including him, which about 95% of the posters here do actively.
And post signing is generally frowned upon everywhere for a few other reasons, like it's a waste of space and makes sifting through threads a tiny bit more arduous. Sigs are also disabled because they're equally handicapped. On the bright side, it makes it easy to differentiate bad posters from others, so you can ignore posts by signers more easily.
