I can't understand one thing: why do you not put them in ignore list, eh?
Wouldn't it be nice if ignoring somebody prevented them automatically from commenting on your own threads? Ignoring on its own is not really that effective depending on what the goal is. If the goal is only to protect your brain from a user's bullshit, then it is effective. Otherwise it really isn't useful for anything.
I think you're referring to popular concept of
blocking users, as opposed to ignoring them which is an entirely different concept.
This means you would
block them from posting in your thread, as opposed to merely ignoring them.
You know where the Meta board is for suggestions
