It's a fancy and lovely way of being an assholic bigot. It's just as bad as writing a program that notes that you're using a PC and should instead be using a Mac, that you're using Linux and that Windows is the better OS, or writing the inverse of both of those opinions.
I much prefer not to tell people what they should be doing and definitely not in such an annoying way.
That said, IE sucks and I do not understand why people would use it, ever.