Speaking at a campaign event in Dover on Thursday, Farage said the party had put in place "a vetting system that was as good if not better than the other parties" for this year's elections.
The Reform UK leader said "hundreds of people who applied to be candidates for the county council elections were rejected... often because of repeated use of words beginning with F and C on social media."
He said others had been rejected "because they just said things that were just ridiculous, outrageous, embarrassing".