That said Ignore is a button that's been around for a reason although it was more convenient when it was color coded since that was an easier way to tell.
You're making me regret not joining BCT earlier!
TBH, that feature sounds like it would be seriously awesome. Was it removed because it was too resource-consuming? (I think I remember reading that.)Ignore still works fine but it used to compile a list of users who ignored X user then give them a different shade of yellow based on how many ignores a person had but your right it was to resource consuming so they removed the color coding but the Ignore still works.
https://bitcointalk.org/index.php?topic=109833.msg1194261#msg1194261
The ignore button starts out clear, and as more people ignore you it turns yellow and then orange. But only other people see your ignore button, so you cannot tell what color it is. The obvious way around that limitation is to have somebody tell you what color it is, thereby giving you some idea of how obnoxious you are.