Freebies can ignore up to 5 posters, but you have to make sure that it is enabled. Go to 'settings : my ignores' and make sure the ignore filter is enabled. You can also block any posts that are replies to an ignored poster. Once tose settings are enabled, you can go to a poster's info page and click 'ignore'. If you have a PM from them, you can just click 'Block xyz's Private messages' above the message. Those settings have saved me a lot of grief over the last few weeks. haha
In case I forgot to mention it above, Always Just My Very Humble Opinion