Exclude a category from the_category in the single post page

Not sure but i think you can try this

function my_category_filter($cats){
   //exclude these from displaying
   $exclude = array("Large Announcement", "Announcement", "News");
   $Catds = array();
   foreach ($cats as$cat){
      if (!in_array($cat,$exclude)){$Catsa[] = $cat;}
   }
   return $Catsa;
}

add_filter('the_category','my_category_filter');