gathered_data %>%
   distinct(response_var)

# A tibble: 9 x 1
  response_var          
  <chr>
1 Is it rude to move to an unsold seat on a 
  plane?
2 Generally speaking, is it rude to say 
  more than a few words to the stranger…
3 Is it rude to recline your seat on a plane?
4 Is it rude to ask someone to switch 
  seats with you in order to be closer to…
5 Is it rude to ask someone to switch 
  seats with you in order to be closer to…
6 Is it rude to wake a passenger up if 
  you are trying to go to the bathroom?  
7 Is it rude to wake a passenger up if 
  you are trying to walk around?          
8 In general, is it rude to bring a 
  baby on a plane?                           
9 In general, is it rude to knowingly 
  bring unruly children on a plane?