Green’s Dictionary of Slang

supportive of changing, or of a change in, ‘gender identity.

2020		A. Shrier Irreversible Damage 55: They refer to skeptical parents as ‘toxic’—and encourage their audience to upgrade to a ‘glitter family’.
2023		M. Grossman Lost in Trans Nation 106: Will one of the other girls tell her how to buy T online, or suggest she leave home and seek refuge with a glitter family.