I've been asked by the FA at RDU why are you coming back with us when you only just got here, and I didn't find it comfortable answering either. But the moment passed quickly, and the flight boarding process and MR continued. I always try to avoid the same plane returning for that reason, but can't always avoid it. Also once had trouble getting a BP printed at the kiosk, and had to ask the check-in desk to print it; they pulled up the PNR and looked very concerned, and wanted to know in a not very friendly tone why I was flying cross country only to come right back. But they went ahead and printed my BP anyhow, and did not look very happy about the situation. Again, the moment passed relatively quickly, and I moved on with a very pleasant and successful MR. Like other have said, we have paid for the ticket, and all we're doing is giving the airline our business.