My word, are some people really this sensitive to being around others? People of all ages, from all walks of life can be annoying and travelling can be a stressful time. If I were so concerned that someone might annoy me at the airport I'd be mitigating things; use the B gates lounge, travel at less busy times, bring headphones, investigate other airlines. Sometimes airport and lounges are busy - sometimes a lot of people want to travel at the same time. I don't much like travelling on the tube at rush hour and all that comes with it, but if I have to travel then I suck it up. Suggesting BA has a one strike and you're out policy, or worse ban a particular group of passengers just seems totally bonkers to me.