There's no value in making insults for the sake of being insulting protected speech, but in the UK if you're making ECHR Article 10 protected speech that someone happens to find insulting or offensive then that's not a crime. It's unhelpful to permit insults as free speech to prevent some hypothetical future abuse, since all modern dictatorships pay lip service to free speech and instead lock up their political opponents for embezzlement or mortgage fraud or whatever.