Well, you hit one nail -- it is often immature, as in younger individuals who think its cool. I don't care for it either, but to be frank, if that is the worst they are doing, so be it! Just don't read it. There are better things to worry about. Generally, if you don't swear, other folks won't (with a couple of exceptions to do with translations ... somewhat obvious). If they do -- the ignore list is always there. Look for folks with a lot of pos feedback, and usually you won't have to put up with that stuff. Also, remember the old adage -- if you don't give it attention, it goes away ...
Is this a suggestion or just whining? What do you expect to be done about it. No one has time to go through every single feedback and see if it is acceptable or not. If someone gets a feedback that is not they can report it and it will be looked into. If they don't care then it really isn't that much of a problem.
The title of the thread made me click on it, but the contents weren't as interesting as I hoped!
If you come across feedback that does not fit the guidelines, report it and we'll look into it. We unfortunately do not yet have eyes on every possible thing during creational time, so we may not know something is wrong until you let us know by reporting it.