Gridania/Ishgard =/= Elezen. Laws/appreciation apply to all who live there. Everyone born there has more or less the same regard for outsiders. Elezen just happened to settle in the Black Shroud first.

The half-breed thing isn't an Elezen thing either, it's an Eorzean thing. If you never checked out the starter NPC dialogue from Wanderer's Palace Hardmode, a mixed race couple was basically shunned out of their hometown for being a mixed race couple.

Ishgardian nobles/soldiers and Gridanian soldiers are stoic. The average citizen isn't.