I think there should be a way to ignore a person in chat. To that end I made a small script you can insert into the console of your browser. Simply copy/paste it and hit enter. Then just type:
block('USER_NAME_HERE');
It is case sensitive.
It basically just polls the chat and anytime a comment is made by the person you enter, it removes it from view. Have not tested this over long periods of time, but I think it is performant enough to work well in most use cases. Once you refresh your browser you'll have to repeat the process. Don't worry about screwing anything up as you can always refresh page and start over. I would be curious how it works with multiple ignores. Maybe I'll make this into a chrome extension if anyone else finds it useful.
function block(userName){ window.setInterval(function(){ var items = jQuery('li.post'); items.each(function(){ if(jQuery(this).find('label').text() === userName){ jQuery(this).hide(); if(jQuery(this).next('li.post').length > 0){ checkNext(jQuery(this)); } } }); },500);}function checkNext(theItem){ if(theItem.next('li.post').length > 0 && theItem.next('li.post').find('label')){ theItem.next('li.post').hide(); if(theItem.next('li.post').next('li.post').length > 0){ checkNext(theItem.next('li.post').next('li.post')); } }}