Is far too common. It's an easy way to turn off many players and DMs from having interest in your character. It looks crude. Please vary your curse words. Be more creative.
Be Especially more creative with your insults. You call someone an 'idiot' or a 'fucker', and it's easy to take it personal. You call someone an 'orc inbred' or 'withered old brain', 'worms in your skull', and it's much easier to stay immersive and into the roleplay.
This is an issue that has been brought up repeatedly over EfU's lifespan. And it seems to get better for a while then slide back again.
I had a rummage through the archives and found this post by Barehander from the beginning 0f 2010.
Next time you feel FUCK rise from the depths of your lungs, consider these instead. (http://www.escapefromundeath.com/forums/showpost.php?p=166408&postcount=41)
From the dead, I raise this thread.
Forum necromancy you son of a undead wench