My take on it is this...
... Dumfounded believes that someone who doesn't like the 11plusforum has come on here, and posted under different assumed names.
The multiple usernames make impolite references to a particular person on the 11plusforum whom he or she dislikes.
Now, I don't know whether I have the right end of the stick, I don't know which usernames Dumfounded means, and I don't know who she thinks is being targeted. However, that's what I take Dumfounded's cryptic posts to mean.
However, I think Dumfounded is wrong, as who would bother to do that? Why not be openly rude and offensive here? It isn't heavily moderated. Perhaps Dumfounded has spent too much time studying cryptic 11plus verbal reasoning papers
Anyway, that's my take on the matter. I may be totally wrong.
PS I don't think my username has offended Dumfounded... but if it has, it's totally unintentional.