You're mistaken. A comment with good ideas presented in an insulting/snarky/offensive tone should get downvoted here. In that rare case, it's often helpful to write a comment explaining why it was downvoted (perhaps even with a link to the guidelines), and encourage the poster to rewrite it in a tone that fits the room it was spoken in.

Some people will understand, rewrite, and become productive members of the community. Others will get offended, write back with an angry rant about censorship or something, and with luck find themselves hellbanned. Those are the people who just aren't ever going to be welcome here. Fortunately, the rest of the internet seems designed for them to fit right in.