I've encountered these idiots too - I was blocking them on level 5 of Irk's Challenge, Recon was in tears and so he called Block Dude. First they threatened to have me banned from the internet, then they threatened to have me banned from Blockland, then they threatened to hack me, then they threatened to logic bomb the server in 48 hours.
Now i'm banned from blockland, the internet, my paypal is empty AND irk's server is a smoking hole in the ground
Don't mess with those guys! They're serious business.