add_action( 'wp_enqueue_style', 'wphelp_deregister_styles', 100 );
  
function wphelp_deregister_styles() {
 if( ! is_admin() ) {
  wp_deregister_style( 'acf' );
  wp_deregister_style( 'acf-field-group' );
  wp_deregister_style( 'acf-global' );
  wp_deregister_style( 'acf-input' );
  wp_deregister_style( 'acf-datepicker' );
 }
}