You shot an arrow at a tree, painted a Jewish star around it and declared a bullseye/tikkun olam. I grew up in the Reform world. There was way more concern with social justice than anything remotely Jewish. There was also permissiveness that shocked even us as teenagers. You wanted to be our friends rather than our parents/administrators/leaders. Kids went looking for something to fill the vacuum and they found this garbage.
Not sure what can be done other than education and letting these idiots know that they are awful human beings who should be ashamed of themselves.