If you visit anonymous imageboards, it's because you want to be exposed to the widest possible spectrum of humanity. There's a bias towards being offensive simply because those things are not allowed to surface anywhere else. If you stick around despite that, you'll realize the site has a rather unique culture. Occasionally, you'll run into great stuff that could never be expressed in sites such as this one.
You mentioned /g/ -- there is a daily programming thread on that board with a very long history. I've seen some really interesting projects posted there. Some even made their way here eventually. SerenityOS for example.
I can understand that sometimes there's decent bit of non-hate content on 4chan, but what sort of great content would you find there that couldn't be expressed here, or in some other forum that isn't full of hatred?
Seeing your comments on a few other parts of this thread makes me think that it's probably better for you not to bother with 4chan. As others have kindly explained to you, insults on there are facetious as well as self describing, and of course, derogatory.
If you can't, or rather won't, see beyond that. Then it's just not for you. And that's fine.
You are correct, hate speech is not for me, and when possible I stay away from places where it would otherwise be unavoidable.
But what people have "kindly" explained have merely been justifications for racism and other hate speech that all seem to ultimately boil down to it being normal for 4chan. That, and the excuse of "oh but they don't really mean it" is pretty thin justification.