Unfriendly experience with British Airways check in clerk! Rude unprofessional staff!

Bad unfriendly experience with British Airways check in clerk 04:30AM. Ordered me rudely to remove old bad tag before checking in bag and then booked me in on the worst possible seat ever 30 B. No option anywhere to check in before hand on British Airways website. I will not be flying British Airways again. Not a good experience and rude unprofessional staff!