A fork of Rural Dictionary
A person who frequently posts pseudonymous comments online in support of a oppressed group, but takes no real world action in their own community where they may face backlash, such that their efforts make no difference at best and at worst encourage oppressors to greater levels of hatred or willful ignorance.
Sara: "Tim spends all day arguing with people on reddit, but he didn't sign that local petition asking for greater police accountability because he didn't want to catch flack from his in-laws." Jane: "Bah humbug, he's just a keyboard ally."
An lgbtqia+ ally who "supports" the community by committing acts of violence against homophobes/transphobes.
A person who physically assaults or attacks homophobes are called a red ally since it seems like they have a lust for blood; red allies are not real allies.