Your attempt at logic, like parenting, fails.
Me making jokes about people I have no knowledge of (how they look, their ages, their intelligence, their occupation, or anything) shouldn't impact you in the least, because I know absolutely nothing about them other than that they lost the genetic lottery by having you as their father.
On the other hand, you are mocking a tragedy of the death of a loved one which you are fully aware of. If you can't see the difference between the two, then congratulate yourself on earning the "ITT" name, you pathetic piece of shit excuse of a human.