Finally, the researchers found that rude behaviour can influence how we respond to others. Participants were asked to answer a fictitious customer email that was neutral in tone. Those who watched the impolite interaction were more likely to be hostile in their responses. 

Lead author and doctoral student Trevor Foulk, from the University of Florida, said: ‘When you experience rudeness, it makes rudeness more noticeable. You’ll see more rudeness even if it’s not there.