The same couple parading around, flipping the haters off would be jarring and annoying.
...but only very, very briefly.
Not acknowledging the realities of the game is what is jarring.
It can be perfectly natural for a character who is also otherwise naive, young, sheltered, and emotionally driven to say,
I am in love with an elf/human/breed/whatever and no one can tell me it is wrong!
But if you are a bad-ass assassin, mercenary, sorcerer, etc. then that is a very unlikely proposition. A character like that is more likely to say,
I am in love with an elf/human/breed/commoner/whatever and I am going to keep it quiet. And they are going to keep it quiet. Or I am going to have to do what is necessary to maintain my social position.
Lusting after the forbidden is normal. Expecting people IG to be cool with that is naive. Other characters actually
being cool with it is extremely unlikely.
As always, when playing exceptions, keep in close contact with the staff. Exceptions are never, ever, ever
something you should "get away with" OOC. If being an exception is a part of your character, be up-front about it with staff.
Edit to add: And if the staff says you are playing outside the docs, well...sorry.