The problem now is that bigotry, racial/religious/cultural hate (especially Anti-Semitism) are still grwoing both among the right and the left. Most Western countries are trying to cotroll it by increasingly more stringent anti-discrimination laws which, besides being ineffective, have some side effects like limiting freedonm of speech and even thought. Today our Parliament was discussing higher penalties for all criticism of ANY life style as hate crimes.
The dillemma is: If we punish any supposedely hate speech/thought with jail, soon we'll have to read the Penal Code each time we want to speak, while anti-Semites always manage to cheat that Laws by speaking against Israeli Govt or policies. On the other side, if we soften the Law, hate could become out of controll and become a threat.
Libertarianism would replace that Laws with more efficient meassures. In a society where there is no place to intevention on private life, and respect for human individual sovereignty is essential, we wouldn't have to worry too much about hate speech, since any attack would be punished as an act of initiation of force, instead of the ambigous crime of discrimination.