Expression is hardly to be taken *that* seriously.
But it has very common usage. For example, I have received mail from artists featured in SI magazine, who thanked for free copy, and said that it was odd to see himself among all these tough guys.
Not that it would be 100% accurate description of rest of artists featured, but one can see the reason.
Expression is often used, and it is not necessarily negative remark at all. Basically anything I do, could be filed among "tough guy noise". I take it with pride, but at the same time I feel absolutely nothing in common with the hip hop -esque tough guy / "street cred" -aesthetic, which generally means something entirely different.
Any Finnish people will know the difference, what it means when you got the "kovis". It can be hardly described in English to come out accurately, but there is utmost difference of the nerd in front of class who will listen noise and john cage, and the kovis, tukka silmillä takarivissä... heh...
Lines are certainly blurred, but even if one would pretend otherwise, you know the difference of nerd noise and tough guy noise - at least in humoristic division.