Any cabin crew member who suffers should report this to an IFCE manager.
The trouble is, there is more at stake for some people than behaviour that can be classed as bullying and harassment. As with 320drivers friend, losing long standing friends and people refusing to socialise with you out of work can not be 'sorted' by BA. You could argue till you're blue in the face that real friends wouldn't behave like that but they can and do! Cabin crew are by nature sociable and there will be many friendships destroyed by this IA.