remove meta tags from post

No, you don't need to modify ANY PHP or CSS code: go to admin/build/themes/settings, un-click ALL boxes in "Display post information on" section. It is a global option and will function for ALL activated themes on your site.

Check the node.tpl.php and you will find this PHP code snippet:

  <div class="meta">
    <?php if ($picture): print $picture; endif; ?>
    <?php if (node_access('update', $node)): ?><a href="<?php print check_url(base_path()) ?>node/<?php print $node->nid ?>/edit" class="editlink" title="<?php print t('Edit') ?>"> </a><?php endif; ?>
    <?php if ($submitted): ?><div class="submitted"><?php print $submitted ?></div><?php endif; ?>
    <?php if ($terms): ?><div class="terms"><?php print $terms ?></div><?php endif; ?>
  </div>

Which means the terms are wrapped with CSS tag .meta .terms. Try to apply this code snippet within your custom.css in order to hide ALL terms data from ALL content types:

.meta .terms { display: none; }

I want to remove tags from post as I am happy with tagadelic.