A word describing prejudicial or discriminatory attitudes and actions aimed at gay, lesbian, bisexual and transgender people; and which come from a place of hatred as opposed to one of fear.
"I know your mother is bisexual, but I feel the need to tell you that it's unacceptable for a member of this family to not be straight. (To be clear, I'll lie about this later, preying upon your nine-year-old psyche as if it was day-old play-dough.)"
"Grandma, what you just said left homophobia
in the dust. Surprise! You're just a dirty gaycist
"I hate fags so much that I wish they'd die slowly and painfully from multiple venereal diseases at once. I'm gaycist