Very unprofessional outlook in general.
They reached to me trying to schedule an interview for the same day. I told them that's not possible, and scheduled to a few days later. I expected a call but never received even though I freed my calendar for their interview invite. When I reached out to ask what happened turns out there were two separate meetings scheduled and I was supposed to join the other one. They did not reschedule the meeting, didn't apologize, wasted my time and frustrated me a little.