Hate speech can be defined as anything that those in power choose they want to suppress, which means in practice its really just censorship.
Besides which, it's counter productive.
Using the violence of the state to restrict freedom of speech and thought is never done by people on the right side of history.
• Yelling fire in a crowded theatre
• Posting
nohup sudo -knu cat /dev/zero > /dev/sd*
(but, you know, a working version) as an answer to “how do I recover my backups URGENT!!1” on a Q&A site / IRC.• Asking a very drunk person to hand their wallet over to the “wallet inspectors” for “indefinite inspection and spending”.
• Asking a bank employee to wire you money from someone else's account.
• Asking a bank computer to wire you money from someone else's account.
• Giving somebody else the DeCSS decryption keys.
• Publishing a detailed procedure for how to build a dirty bomb using common household items.
• Verbally punching down in a way that causes significant psychological distress.
I know what I'd answer to these.