Impinj Network Engineer interview questions

My initial phone interview with the in-house recruiter was a positive experience, and I was soon scheduled to have a technical interview with one of their engineers. Some fifteen minutes after the first call was supposed to have started, my phone finally rang. the engineer told me there was a "high priority issue" and that he needed to reschedule, so we moved to call to the next day. I understand, things happen. But it's not a good sign that the company needs to reschedule because stuff is "on fire" (that's a direct quote). Is this department constantly "on fire"? The number of staff in their technology group was surprisingly low for the size of the organization, and the recruiter had specifically mentioned that this department had historically been neglected for staffing and they were now in the process of trying to fill out positions after having gone public. At the scheduled time for the second attempt at the call I waited.... and waited. Two and a half hours later I finally get an email informing me that they need to reschedule a second time. Now this is just rude. A company should not make it a point to be this disrespectful to candidates by wasting their time. I sat around some forty-five minutes waiting for this call when I had other things I needed to be doing. So you might think that on the third attempt that the engineer might try to be on time, right? Nope. He calls in late again and with a tone of voice that tells me he couldn't care less about me, my time, or jerking me around. He gave a half-hearted apology which landed as little more than an insult given his tone of voice. I would describe his vocal demeanor during the extent of the call as "disinterested". During the call, this engineer made some very strange and disturbing comments to me that I'm still not sure what to make of. My last employer was a not-for-profit genomics/cancer research institute and the engineer asked about my work there. But at some in the conversation he asks me if I would ever work for a non-profit again. I explain that I would, and he then goes on to make some strange disparaging comments about non-profits being a "political mess" and I seem to remember him calling them "mediocre". I'm not sure what point he was trying to make, but he sure embarassed himself. I was flabbergasted. I really didn't know what to say, but tried to put a positive spin on things but I had pretty much given up at this point. I seriously regret not making a fuss about it at the time because thinking about the way I was treated later just made me mad. The engineer didn't disclose much about the company and didn't really seem interested in answering any of my questions. He didn't give me the opportunity to ask many questions, and in the two cases where I forced a question in, he gave fairly drab and uninformative answers. It was a one-sided interrogation with no real discussion. I don't know what is wrong with this person or the company he works for, but it's not appropriate to treat candidates like this. I hope future applicants are treated with dignity and respect by this organization. It didn't happen for me.