I'd call it more like free association or rambling - sometimes interesting, sometimes not . I've never gotten the impression of trolling, but I suppose one person's troll is another's billy goat gruff - ahem. Banning seems a tad harsh when one can easily avoid it by the age old dictum - 'check the nick before you click :-)

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken