Remove Jetpack styles - list of enqueued jetpack stylesheets to remove if necessary. via - http://www.tjkelly.com/blog/remove-wordpress-jetpack-css/

remove_jetpack_styles.php

function remove_jetpack_styles(){
  wp_deregister_style('AtD_style'); // After the Deadline
  wp_deregister_style('jetpack-carousel'); // Carousel
  wp_deregister_style('jetpack-slideshow'); // Jetpack Slideshow
  wp_deregister_style('grunion.css'); // Grunion contact form
  wp_deregister_style('the-neverending-homepage'); // Infinite Scroll
  wp_deregister_style('infinity-twentyten'); // Infinite Scroll - Twentyten Theme
  wp_deregister_style('infinity-twentyeleven'); // Infinite Scroll - Twentyeleven Theme
  wp_deregister_style('infinity-twentytwelve'); // Infinite Scroll - Twentytwelve Theme
  wp_deregister_style('noticons'); // Notes
  wp_deregister_style('post-by-email'); // Post by Email
  wp_deregister_style('publicize'); // Publicize
  wp_deregister_style('sharedaddy'); // Sharedaddy
  wp_deregister_style('sharing'); // Sharedaddy Sharing
  wp_deregister_style('stats_reports_css'); // Stats
  wp_deregister_style('jetpack-widgets'); // Widgets
}
add_action('wp_print_styles', 'remove_jetpack_styles');