1) People who still don't understand what is bitcoin
2) Who get affect by use of bitcoin
3) People who lost there equity due to bitcoin
except these option I don't think any reason behind hating bitcoins.
4)People who are too paranoid
5) People who don't like spending time online
6) People who think bitcoins are fake.
I think all these kind of people can have their minds changed. It just takes a little bit of insentive.