You're a writer, and you're represented by a small established agency.
The agency's lone assistant (in his late 20s) is posting on a personal page not using his own real name, but does reference the agency’s name.
Some of the assistant’s postings could be taken as bespeaking a macho, not terribly enlightened attitude to women: links to "adult" sites, etc.
The personal page comes up pretty easily in a search engine – under the agency’s name. I doubt anybody else in the agency knows this is the case. The assistant may not even know it.
A lot of people in publishing are women. Will the assistant's lack of discretion hurt the agency, or its clients, or him?
No one in the industry spends much time reading myspace pages by assistants.
He'll get the message soon enough, but no one is going to think less of you for his idiocy.