Brussels - making a transfer, arrive on remote stand, bus takes 15 mins. to arrive, always being taken to a completely different entrance by the bus every time with no staff to advise you where to go to start seeing arrivals/transfer signs again, miles to walk, rude security, rude police, rude shop and bar staff and of course rude Sabena staff...
I pass through BRU twice a month and it is by far the worst airport all round!