People argue their case like adults all of the time, the problem is that some people don't like the arguments that are being made. Argue your case like an adult...but you can't use the following arguments: X, Y, Z. Well, if they can't use Arguments X, Y, Z then it seems like they're being asked to abide by some unspoken PC code.
You posted a wonderful diatribe but it completely sidestepped my point.
Only one side has an issue with PC speech. The side that is against PC speech shouldn't have a problem with the race card or with calling people Nazie regularly. They shouldn't have a problem with any language used in the public space. Asking any group to change how they about any subject is asking them to be PC.
A person cannot be against society becoming too PC and also upset about society's use of language directed against their preferred group.
Here's a simple example to help you stay on track. "Muslims are terrorists and can't be trusted." says Person X. When told that the statement is xenophobic, Person X says that it's the truth and the PC police are going overboard. When Person Y calls Person X a "racist", Person X says "Why do you call everyone racist, you shouldn't speak that way."
Person X doesn't see that the request for less volatile language contradicts the previous desire to express volatile language. Person X abhors the PC code when it restricts Person X's speech but implicitly appeals to it when the speech is directed at Person X.
That is the point that I am making.
Bullshit. There are tons of people on the left who have an issue with PC speech. The vast majority of the country has a problem with PC speech. But it isn't the PC speech codes that are the issue, its the punishment and the methods used by the PC police to attack people who break the speech codes and the formalization of speech codes in law and by law. When professors can no longer say things that are scientific fact because its against the speech codes there is a problem.
You can whine and bitch to your hearts content about someone saying something racist or mean. I don't care and will just ignore you, but if you try to get violent, or attack someones ability to earn a living then that is not about what you think should be inside or outside the Overton window. That turns into an attack on someones ability to live and survive.
Using your own example, telling someone they are xenophobic for saying, "Muslims are terrorists and can't be trusted" is fine. Its essentially devoid of meaning, but go ahead and say it. But if you go to someones boss and tell them they are xenophobic and racist and that if they don't fire you right now you are going to start a boycott then that isn't about speech any longer.
There are definitely people acting hypocritical here, but its not the people against speech codes. Its the group that tried to change the definition of racism to include a power component so they didn't have to address specific racist remarks and structures that they knew were common. Hypocrisy from the SJW brigade is all over the place, they are such a hypocritical group that they have acted in serious and direct ways to downplay or hide their hypocrisy. The racist girl from the NYT, the feminist professor from NYU, the, "there won't be peace until a great deal of white blood has been spilt" professor from Texas A&M, the "when are we going to admit that college age white males are a problem population" professor from Boston, etc.
There is simply no equivalent from the right on these issues, none. If a professor said the same thing about any other group, they would be fired and their professional lives would effectively be over. That isn't justice or fairness, that is an angry bigoted mob and that is what SJWs are.