I can’t stand to see folk wearing Bluetooth in-ear microphone headsets out-and-about. I really can’t. It’s one of those things that seriously winds me up. I have no problem whatsoever with people wearing them for work purposes — delivery drivers, plumbers, you know, folk who have a specific use-case requirement. Sitting on the train wearing one is entirely unacceptable. By all means use one — but IN the office. Or, even better still, when someone is on the phone wanting to speak to you. I know its illogical. It just winds me up.