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Rainbow shower
(slrpnk.net)
Grasweeti - Portmanteau of sweet and graffiti
A community to share pictures of cute graffiti, stickers, wheatpastes and more. Be careful to not dox yourself and if you can, please provide an image description (here are some tips for doing that).
It's random colors and not any specific LGBTQ flag. Either way, colors being seen as a good and nice thing independent of that still makes it seem odd. It feels like it's trying to say the kid is shielding themselves from good.