Who didn't try to help in a question and got a bad attitude from the author?
In those occasions what you do? You won't answer any more questions from that member, right? So, you all have your own black list stored somewhere?
I don't and sometimes I'm afraid that I'll forget that member name and will try to help him again in the future without knowing that in the past he didn't like my help. Wouldn't be great to have a Black List tool here in EE so we can filter out some member's question?