The Apple message board is a beta of sorts. When Yahoo wants to initiate changes to their boards they choose a popular one as a testing ground to gauge the feedback. Though there are some good posts over there, unfortunately the Apple board is now one of the largest collection of #$%$, jerks,selfish and self-centered lowlifes I have ever witnessed (with the possible exception of Craigslist's Rant and Raves section).
Yahoo doesn't have the same "Ignore User" button to click on the AAPL board (why in the world does yahoo have different formats for different boards?), but you can still ignore users there. Next to the "Reply" button is a small button with a down-pointing arrow. You click on that, and the "Ignore User" option appears. But there are literally hundreds of sociopaths that post there (irrational, anti-semitic Apple haters), so you would have to spend all of your time there constantly ignoring people.