I’m imagining Hamlet back at school, before news of his father’s death came in. Do you think he’s the kind of guy (kid?) who was very social, had many friends? Or was that biting sense of humor and condescending tone too much for those around him?
I’ve heard it argued re: Horatio that he was either a) Hamlet’s best friend in the world, or b) just a nice guy acquaintance who tried to pay his proper respects, and got caught up in the whole thing. I honestly don’t know the answer either way.
Rosencrantz and Guildenstern, I assume, fall more into that category of “I know them, but they are not my friends.” I don’t see it as a very great surprise that they turn on Hamlet so quickly, as I have no reason to imagine them as close confidants to begin with.