Are you in this for the recognition and applause? For feeling smarter than and superior to others? You're here of all places, so no you're not. Materialism wouldn't be a revolutionary philosophy if it fell in line with what people readily agree with. Your friend sided with you on this and that is good. Keep being educated and correct, and he'll agree with you some more. When you agree on enough, you'll be able to teach him how to be just as correct. Then we'll have another comrade, and you'll have a better friend.
The education is a thankless job, a fight against established thought. Our props will be the society where you no longer have to be an educator. And you're getting us closer to that, one opinion at a time. So keep your head up.