The list of those others despise and ridicule is limited only by the unempathetic imagination of the detractor. Sure it is. That's why we have a First Amendment to our Constitution guaranteeing free speech in a free society. Of course not, or maybe, depending upon how disgusting certain beliefs and behavior may be, from your perspective, to you and those who agree with you.
Open debate is the mortar of freedom.
Some arguments against some causes carry such moral imperatives that politeness in their expression would appear a compromise with evil. Other arguments are so monstrous in their ignorance that a rational hearer recoils. You only get your First Amendment Medal when you support the right of some lunatic to say things about others that offend to the bedrock of your humanity. The law properly forbids and punishes harmful behavior directed toward others, but speech is protected. We have to.