He was not sentenced for "offensive posts". He accused person of being pedophile. That's not simply offensive. He accused people of other racial stuff too. If you are tough online, you better be ready to back it up once you are faced with what you said in person. If he had any proof of what he said, he would not be sentenced. He lied, tried to destroy someones reputation by lying and got bitchslaped. He won't go to jail if he does not repeat his lies for some time.