Be careful what you say and more particularly, what you write. These things have a way of coming back to haunt you. Once you write something on the Internet, it is there for all eternity, like it or not. Perhaps you felt you had good reason to write about Arnold raping an underage girl in your apartment. Let's hope you didn't make this up or exaggerate the story....talk about slanderous and libel comments.
Slander is spoken; something that's written (like the forum post in question) cannot, by definition, be slander. Apart from that, you make a good point.
Arnold most likely can afford much better lawyers than you can should he decide to take legal action against you.
As if Arnold would give a shit about the delusional rants of a long-ago washed-up nobody who spends his time "arguing" with the likes of Vince Goodrum on the Interwebz.