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Hey there,

I think that you need to sit down with them and have a stern talk with them and let them know what self harm actually is and why it is offensive for them to continue to make fun of it. A lot of times, people make fun of the things they don't understand. It's dumb, I know. I'm not saying you have to tell them about your self harm. If you want, you can let them know a bit about what a self harmer goes through and say that you learned this from "a friend you have." Hearing what they actually go through may get them to understand a bit better than what they do now. You can also print out a pamphlet to show them. You can also tell them that you really would like it if they showed you some respect and stopped making these comments around you.

But, definitely try and have a firm talk with them to get them to hear it out. Maybe adding a bit of background to telling them to stop will work.

-Dez