As a Swede, I wish there were words to convey how ridiculously tame the word "svenne" is. It is difficult to describe, but if you start by considering the word "cracker" to be the most extreme form of hate speech there is, I want you to know that you would still likely be comfortable calling your in-laws this the first time you met them. I guess the closest thing in English I can think of is describing someone as a "guy" of some knd. And I'm not even sure that conveys how absurdly inoffensive the term is.