A big fight
Because of the invitation fiasco, the guy was quite furious. He explained it to his girlfriend, who responded by having a huge argument about the issue. She informed him that if some people didn’t reply, she might be able to squeeze a few of them in.
However, the guy’s friends took it as an insult. He felt it was a slap in the face and that things were only going to get worse, given how furious he was still several days later.