People are, on occasion, very angry in response to spam. They sometimes send flaming emails filled with invective, questioning the parentage and every other possible quality of the sender and the product being advertised. To some, this is is considered a new brand of annoyance, specific to the innertubes.
Those people are wrong, as it turns out. This is not a new phenomenon. Don't believe me?
Check out this letter sent by Mark Twain, in response to a patent medicine advertisement, more than a hundred years ago. He writes, "[You are] without doubt the most ignorant person now alive on the planet; also without doubt [you are] an idiot, an idiot of the 33rd degree, and scion of an ancestral procession of idiots stretching back to the Missing Link."
Mark Twain, you're my hero. You can read the whole letter over on the awesome Letters of Note blog.