Answered by Stephanie, Hiring Expert at AT&T Inc., on Monday, July 18, 2016
Hi there! In reading your question, I've opted to look at it from a couple of different perspectives. First off, how great that you have someone interested in talking to your further. It's a key first step to getting in the door to impress with your interview skills. Second, give people the benefit of the doubt, a lunch break is often the time that initial phone screens take place as they are typically a shorter time commitment than the full interview. Chances are good no rudeness was intended, and if this is a company you are really excited about, perhaps your best option is to gracefully overlook the perceived slight and reiterate your next available time.
The HR professional you spoke with is the gatekeeper here, so this is probably not the time to give your two cents on how you'd prefer to be spoken to. If you want this job, then use all your resources to get past this pretty minor speed bump and on to the main event interview. Good luck!