I think it is mixed here, I understand both ways.
You asked for originality and they brought friend chicken. Maybe this was all they could come up with? Maybe they didnt have any time? Maybe they just didnt know what to bring and were scared that it might not be nice enough.
Then you tell them off and insult them in front of everyone else. If it was me I would feel bad too, I would not want to be there, I would want to go home as fast as I could.
Then there is your side, you inv them over because they are your friends, you expect a certain standard of them coming over. They ignored it, you feel as if they are lazy, or just not trying. Then it seems they ere trying to ruin the evening.
Im not sure what I would have done either...