that's the right of every people here in EU. If you offend me (online or offline) I can sue you and you could face trial.
It's called defamation.
Nothing to see here.
EDIT: insult here must be read using its most informal meaning (offense sufers the same destiny), not the legal one. We have different wording for the two circumstances "ingiuria" for the legal term which has been depenalisedd years ago and "insulto" to mean offending someone.
Saying to someone "pedophile" is both an insult (a personal attack) and can be defamation, if the person is not a pedophile.
The system is designed to be highly protective of the presumption of innocence, a judge must decide if the circumstances need to be solved in a trial by another judge or the case can be dismissed because there isn't enough substance to call it defamation.
So every depiction of EU being swift to put people in jail for their opinions is highly exaggerated.
"Offending" someone is meaningless. Anyone can claim they were offended by anything, but that doesn't automatically make the thing illegal or injurious.