Accents can be a real turn off.

Source:  

http://www.scotsman.com/news/accents_can_be_a_real_turn_off_for_scottish_listeners_study_finds_1_834743

• Scots are turned off by accents that don't sound like their own.
• The research found that people's brains switched off when listening to non-native voices but were alert when hearing a Scottish accent.
• The findings suggest that Scottish people have an in-built, unconscious bias against outsiders.
• Brain activity would decrease when listening to a Scottish accent as the participants could process the words spoken in their own accent more quickly and with less effort.
• That suggests that people were paying more attention to the voice of someone from their own group than from a different group. 
• The initial results suggest such vocal samples somehow reflect group membership or social identity, so that 'in-group' voices are processed differently from the 'out-group'.