YKYAGW you can tell off someone who claims to know how to run a server better than you when they forgot to configure the firewall properly.
Once, I met a sysadmin who was having trouble getting a webserver to come online. Idiot forgot to open up port 80 for Apache to start working.
And a Minecraft Server admin claimed to run a better server than me, but he couldn't get it to work properly. Open up port 25565, n00b.