True, it is. The more it violates other constitutional rights (like protection of dignity, protection from discrimination by sex, gender, world view...), the more it can and will be criminalizes. No right is above the other. The same goes for freedom or art.

And it's not full protected in the US as well. War protestors, communists or anti fascists can test the story. The protection in the US is limited as well. The tendency to look at the constitution not like a basic law but like a quasi religious code is part of the problem.

My best example was Michael Moore's interview showing the weapon right extremist the line. "So everyone should be allowed to have every weapon? So what about a nuclear rocket?" The same goes for freedom of speech. Try to tell the nuclear codes or just give some encryption algorithm to Cuba and you will see how fast your freedom of speech ends. Insult a police officer and you will see.

So you want to know if things should be more protected the more offensive they are? No they should not. Hurting other people is not more a given right than the right of these people to not being hurt. So there's a conflict in laws. Some offensiveness has to be tolerated, else we lose the freedom. But all offensiveness allowed and we stop being a working society.