There's some interesting things to consider though.
Different countries and through history, different attitudes have been the norm. An example might be how being on the left in the USA is more aligned with our mainstream right than anything.
Their right is extreme to most UK eyes.
Our left would be extreme to them and 'socialism' is a dirty word often, it seems.
Because we are used to different norms.
So what 'far' means will vary. To someone in one country far right or left in a different country might be standard middle ground to many of the people who live there.
Also in certain situations ordinary people can support things that are extreme. The Nazis are the example usually used for this but I'm sure it's happened elsewhere.
Religion especially in more closed communities or in countries where it's the norm. Can lead to things which are many not seen to me (us) as generally right or left but are nonetheless obscene views (to my eye).
There's also the point that racism in this country when I was growing up was the national front. It wasn't words it was deeds. They wanted to kill people. They did kill people. It was visceral real life murderous terrorism. Is that the same as someone now who says nasty stuff but wouldn't hurt anyone or want anyone else to hurt anyone? (Obviously racist murders still go on but there isn't such an obvious open movement United and across the country).
Just some thoughts that occur to me that I think would be interesting to discuss.