Sam's Club Merchadiser interview questions

I wish I could describe the interview process but I cant. I showed up 5 min early to the interview time the hiring manager said would work best for him, I was advised from a employee that the hiring manager was at lunch, Why would you schedule a interview during your lunch break? Anyway that is fine I can wait. I sat for 30min in the café waiting for the hiring manager to arrive but at last no one came, I informed the employee that sadly I could not wait all day for the manager to come because I had other interviews scheduled that day and wondered if she knew how much longer it might be. She became snarky with me and rude, and acting like I was there wasting their time and not them wasting mine.... To be honest I could of waited a little longer but the rude employee threw me over the edge.