Please! Be my guest. Do go ahead and show why Kant is wrong! But don't be surprised when you fail, just like several hundred years of others.

Critiques of Kant mostly rely on the introduction of a logical contradiction and then the critiquer dancing around and praising how clever they are. The rest of the critiques of Kant pretty much boil down to temper tantrums, hissy fits and name calling.

BTW - The reference there goes directly back to what Severian had brought up with obligation, i.e. duty. You need to read an understand Kant at least a bit though to get the reference and how it applies. It's not directed toward the broader discussion. Well, until you decide to apply it like that.

As for him being "some old dead dude", you appear to be showing a general lack of knowledge about moral philosophy. Kant is the giant.