personally i would've just said what the forget are you talking about 'downloading ram' are you high and scoffed. and wouldve walked away since they were taking the piss out on me anyways, and that wouldve been that last of it.
since you said you were friends "i guess" i dont think he really was that important to you, and you were just pissed for the unneeded hostility they gave and you had pent up anger.
oh well man
edit:
honestly though if someone is taking the piss out on you like that and youre aware of it just act like he is absolutely handicapped for thinking that so the joke is on them
edit2:
because of your 'friend' reacting so inappropriately and out of context to a question i feel like he was two-faced anyways and was probably bitching about u to the fat other one.