The two GB Airways passengers for Tenerife were not offloaded due to the other passengers refusing to fly with them.
The "Gentleman" and his son in question were offloaded, arrested by the police and banned for life from British Airways or its subsidiary companies for using threatening and abusive behaviour to a BA staff member. The rumour that passengers refused to fly with them is unfounded, but probably caused by the rush of people that volunteered to act as witnesses!