"I do understand logic well enough", still, you just ignored what I said, and repeated yourself. If you understand the logic, answer what I said, don't just talk about something else.
I didn't ignore what you said. In your example the characteristic c was what was being compared. So it doesn't help to compare A and B by dissimilar qualities.
In my example c was almost exactly the same as what was being compared, but the wording was slightly different. A parody of what you said, sure, but still valid