Security Threat? or am I just a girlie man LOL

[sn8k]

I need some advice from the group - concerning whether or not I should consider this individual a threat to my communities and/or if I am over-reacting to this incident. A little background.....

I lease a server and have about 30 sites on it - about 6 of those have vBulletin communities with one, an online store that the individual makes a good sum of money on, and the rest just personal websites and such. I have closed off all unused ports, have a firewall installed to prevent access to the server from a lot of third-world countries are considered a "hacker's paradise", and basically take the normal precautions that most of us do to keep the server and the sites running happily along.

Into the picture we have an individual that has shown a distinct hatred toward me and has gone through great lengths to personally assault my character in private and in public - with his latest public words being he "hates me with a passion". This individual also is becoming "web savvy" (being somewhat of a newbie webmaster himself) and also, runs a vBulletin community.

I would like to get your input on whether you feel this individual would pose a threat in regards to the security of my web server and sites. Having access to the latest upgrades, security bulletins, ect. put out by vBulletin - I feel gives this individual some very keen knowledge on exploits and vulnerabilities of the software. I also feel that if not now, in the not-too-distant future, he could very well start his newly acquired internet knowledge towards the "black art" of hacking (denial of service attacks, ect.). It's just in his nature to belittle those who do not share his "unique vision" of life... OK, he's a pompous ass to people like me who don't agree 110% with his views. LOL Seriously, we've had our fair share of disagreements, but I've let them all slide... until his last outburst came out of the blue. I honestly did or said nothing to provoke his anger this last time - he just felt the need to come at me with his insults and the public admittance of hatred. I feel this is a big escalation of hostilities - and one which I have acted upon as being a threat. I have since added his IP addresses to my server's firewall to totally prevent his access to my server in an attempt to rid myself of any potential threat to it.

My question to you is quite simple - would you take similar if not the same precautions to protect what you have worked hard for? Or am I over-reacting to a situation that would be considered commonplace and no need for concern.

Thanks in advance for your opinions and incite.