twitter.rb

require 'twitter'

client = Twitter::REST::Client.new do |config|
  config.consumer_key        = ""
  config.consumer_secret     = ""
  config.access_token        = ""
  config.access_token_secret = ""
end

begin
  client.friends.each do |friend|
    client.friendship_update(friend, retweets: false)
    puts "Disabled retweets for #{friend.screen_name}"
  end
rescue Twitter::Error::TooManyRequests => error
  puts "Retrying in #{error.rate_limit.reset_in + 1}"
  sleep error.rate_limit.reset_in + 1
  retry
end