This kind of message belongs in the same bin as "diets violate the laws of thermodynamics." Top posting isn't annoying, it's INAPPROPRIATE top posting (which you fail to point out) that's annoying, but an incomprehensible inability to trim quoted messages that tops the list.
Ignoramus18155 said:
A: Because it messes up the order in which people normally read text. Q: Why is it such a bad thing? A: Top-posting. Q: What is the most annoying thing on usenet and in e-mail?