Twats who use "Freedom of speech" as an excuse to be complete and utter cock-sucking, dribbling shitbags.
I can't really think of an example that is globally offensive, but I'm sure you've heard of people who say child pornography should be legal due to freedom of speech.
One example is of people complaining that the British government has arrested people for sharing information about making bombs. This was to cut down the risk of IRA attacks, but apparently it made Britain "Less Free". I'm sorry, but if not being allowed to talk about making bombs prevents me from having nails blown through my head, I'm all for it.
The freedom of speech is a right, but one that shouldn't be abused. It just always seems to be used to make excuses for criminals, much like the Human Rights act.