Thinking back on my own school days, I'm honestly getting confused about DD's social obligations to AG. I'm picturing that when AG strolls up to DD and her friends, DD feels obligated to include AG in the conversation, to make extensive replies to her comments, etc.. And I'm wondering if this gives the impression of friendliness and inclusion to AG, when that's not really what DD wants to convey.
Would it be rude if DD and her friends did not make an effort to include AG in the conversation, even if she was standing right there? (having joined them of her own accord) If AG said something, would it be rude for the others to be like, "Oh. Hmm," then go back to their own conversation?
I ask because I feel like this was considered the "nice" way of rejecting someone when I was in school, and it seemed to be fairly effective. But, I'm having trouble figuring out if it's actually rude, or not.