"are absolutely"

Solution 1:

The sentences CAN mean entirely different things.

"You are absolutely a pedantic snob."

The word absolutely here is simply an intensifier of the insult. The sentence isn't semantically distinct from "You are a pedantic snob." The absolutely serves only to convey the emotion and intensity with which the speaker is communicating.

"You absolutely are a pedantic snob" sounds most to me like a rebuttal to a claim that one is not a pedantic snob.

He: "I am not a pedantic snob."

You: "You absolutely ARE a pedantic snob." [capitals used for tonal emphasis]

In the case that it is said apropos of nothing, the meanings between the two arrangements are interchangeable.

But suffice it to say, your friend absolutely is an absolutely pedantic snob.