She suggested people 'contribute to OSS'; the organisers told her it was against the event's code of conduct because it was a form of 'micro-aggression' and 'othering' (whatever that means).

It took me a while to work out what the problem was too - but you need to read the screenshots in the first tweet, or at least the last one. (I clicked and the first one opened without indication of more, and seemed innocuous.)