I don't understand why these need to use swear words and aggressive tone? Wouldn't it work just as well without them?
I maintain a site (for a loose definition of "maintain", I suppose) called http://fuckingblocksyntax.com. It's wildly popular in the Objective-C development community, due in no small part to the memorable domain name. But the site itself doesn't contain profanity or over-the-top machismo bravado, and there's a safe-for-work mirror URL at http://goshdarnblocksyntax.com.
A little profanity goes a long way.
I'm never paying for this website again.
And, more importantly, it makes the whole thing much more eye-catching. It's a fun way to a deliver a message - as a vitriolic, spit-flying rant. It would be ineffective if it was friendly and delicate.
Depending on the company, swearing might not be tolerated at all. At my company it's fairly common, but I only do it when in meetings with people I'm fairly comfortable around (my team, my manager, people I commonly work with).