This is My first time using reddit, so I apologize if this isn't the right place to say this. 

But My friend (15) has a younger brother who has started self harming (11). My friend (we'll call them Kale) started noticing that their little brother had a bunch of extra small cuts on their wrists, and their little brother making jokes about cutting himself...

 Then found out that little brothers ex boyfriend (13) was telling the little brother how hot is was when someone cuts themselves, and how it makes you look tough to have those scars. 

We believe this to be a big contributing factor.

Kale has an older sibling who self harmed, so they found this situation very triggering, so they asked their oldest sibling what to do. Kales older sibling told their Mom, and the Mom delt with the situation (Keeping razors hidden, hiding the kitchen knifes, ect).

It seemed to be getter better? (Aka, Younger brother probably couldn't find the knifes and razors for awhile). And he cut himself in a very obvious place about two weeks later, Kale tried talking to him about it, and younger brother just made jokes about it and brushed it off, and tried telling kale they do it for fun sometimes. 

Kale who has delt with their older sibling in this situation, didn't realize how much this would trigger them till now. So while having this conversation, kale was trembling and threw up, younger brother was grossed out and they both dropped the conversation for that day. 

The next day, Kale asks younger brother to hold their hair up while they cleaned out their new ear piercings (human hair tie I guess). Then younger brother says "I'm so cool" while holding kales hair out of their face, kale asked what he meant by that and he said "Because of My new battle scars" (his new cuts). As the last conversation about this triggered kale, they didn't ask anymore questions. 

Now younger brother is saying things like "We cut flowers because they're pretty, we cut ourselves because we think we're not" 

Anytime he tries bragging about the cuts, he acts like it's something that makes him cool. How do we handle the situation?