Behaviour has to be regulated where it adversely affects others.
This is where the concept of rights fits in. We establish a basic set of rights based on universal principles (fairness, equal treatment under the law, transparency, accountability, ect, ect) and we use these principles to determine whether the rights of an individual or group have been violated by certain behaviour or actions.
There is a phrase "your right to swing a fist ends at my nose". Generally speaking, under the principle of fair, indivisible, universal rights, you are free to do as you like, until and unless what you are doing violates the rights of another. When rights cross over and interfere/interface with each other, then it goes to the courts, the judiciary or legislators to sort out the answer.
I do not propose regulation just to force everyone into a mould. I am not suggesting a monolithic whole. There is offensive behaviour that is subjective: that is to likes and dislikes; and there is offensive behaviour that is objective: that is directly impedes and harms others.
If your offensive behaviour is to go around stabbing everyone, you're going to have to be stopped. I think that's plain enough.
The principle comes first, then the rights, then the behaviour. You don't need to regulate a series of specific behaviours like 'don't stab people with knives', 'don't hit people with cricket bats', 'don't punch random strangers when drunk', when you have a basic right to health and a basic right to safety already enshrined in law.
Giving and taking offense is subjective. I find female genital mutilation deeply offensive. However, others do not, and practice it as part of their religious/cultural heritage.
How then are we to resolve the incongruity? If we apply a basic human right, like the right to health, then we could determine whether this behaviour is in violation of the rights of others. Next we need to decide whether application of that right is sufficient to overcome the beliefs of the people that practice this behaviour. This is again where the judiciary and legislators step in - universal application of human rights is one of the basic principles of governance.
So if you establish rights founded on basic principles, you don't need to regulate behaviour.
The trouble with rights and principles becomes this: who's right and principle do you defend?
Everyone's rights are defended, as rights are universal, inalienable and indivisible across the society.
Principles are not defended, as they are not applicable to individuals. Principles are the foundations that rights are built on.
The defense must be made on how the behaviour condusive to those rights and principles affects other's rights and principles. Behaviour has to be regulated for the benefit of all.
Regulating behaviour is one very short step away from an absolute dictatorship. Forcing modes of behaviour on people in the named of the "benefit of all" is eerily similar to the kind of thinking in 1984.