You can now do this.
DEMEANOR [RACE] supersedes DEMEANOR [GUILD] - If you're cold to Dwarves and warm to War Mages, you will be cold to a Dwarven War Mage.
DEMEANOR [GUILD] supersedes blanket / default demeanors, obviously.
Profession titles / pretend guilds are NOT taken into account for this.
Your guild will only be taken into account if you have the SET PROFESSION flag set. If you have SET !PROFESSION set, other people's demeanors towards your profession will not apply to you, as you are not outwardly recognizable as a member of your guild.
This is in Prime and Plat right now, and will land in TF this week sometime, assuming no explosions occur.
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"The ninety and nine are with dreams, content but the hope of the world made new, is the hundredth man who is grimly bent on making those dreams come true." -E.A.P.