Welcome to the job market... It's been like that forever. Are you in the Bay Area? It's worse here companies really don't give a crap and right now, there are a zillion candidates on the market. If you apply via linkedin, you can see how many candidates applied to a position. I see something like 500 people for a single position at a unicorn startup. I can't even imaging the Google's, etc.. we're probably talking about thousands of candidates per position. So I'd feel lucky if I were you that they brought you onsite.

Job hunting and car shopping are very similar. It's all about smiling during the sale, then if you don't buy rudeness takes over. They're already onto the next customer. It's business my friend... just get over it and move on, there are a lot of opportunities out there and the hiring process is extremely subjective. I got rejected at round one from tiny startups while working my but off and landing jobs at the best companies in our field. So, don't get married to a company. They're hurting themselves by acting like that...