Affinity Software Engineer New Grad interview questions

I was invited to do an all day on-site interview, but after 2 initial interviews and lunch, was told they were no longer interested. There were supposed to be 4 total. While I don't really care that I was rejected (it happens, not every technical interview goes amazing) this struck me as completely unprofessional and rude. I took the time to travel to San Francisco, skipped classes, and paid for my own travel and you cant even be bothered to finish the interviews? I don't care that you are no longer interested in a candidate, finishing the interviews is basic manners, you have asked this candidate to come to you, even if you aren't interested, use it as a chance to train your interviewers for heavens sake. Would not recommend working here, as based on this interview, this company is lacking in any basic sense of empathy, and based on that, probably lacks concern for their own employees. I did not post this originally because I was just going to let it go, but at my current start up, they specifically mentioned n e v e r to do this! Go figure.