This is a fundamental disagreement. What you call a jerk is what i see as a interesting person. Carefully measured polite language is absolutely exhausting for many of us. It is much nice to simply tolerate different people.
People have cultures and personalities, many which are not understood by other cultures and personalities. I prefer us to exist side by side instead of banning one in favour of the other.
Race is just a very vague method of generalising large groups of humans, once that is shown to be decreasingly useful as we learn more accurate methods. As a result even the definition is vague.
These days race has mostly been reduced to vague groups of appearance; for medical/genetic groups we usually have better indicators. It is still useful as a vague appearance descriptor. We shouldn't claim that a visual description is racism, it is just a handy tool.
There are plenty of people who happily interact like this daily. It is a personality. People talk and act in different ways, they are different people, I think it is reasonable for them to continue acting like themselves.
I don't find the way Linus writes offensive in the slightest. To me it is mildly amusing while making a point. I don't want to have all communications in a forced polite cotton wool tone, it becomes robotic. Further encourages people to act over-sensitive, making it harder to communicate.
I had that issue, then I accidentally scrolled down and found the button.. something silly like that. A lot of the installation UI hides the skip buttons unless you scroll about.