Hated with Frostborn

Got a question about hated reputation with Frostborn faction.
Always played Horde and its 2nd time i got hated with them, I noticed that it happens after few quests (3-5) for Argent Crusade in Icecrown zone and i also done pretty much quests in Zuldrak for same Argent Crusade and nothing happened, so i think its only quest or zone issue.
But its alliance faction so i shouldnt have any reputation with it like with booty bay after killing some goblins.
Is it possible to delete their reputation from my characters? I cant raise rep with them anyway

Weirdly, as Alliance, I've had the inverse of you, getting "Hated" with a Horde-only faction that can't be raised.

Thanks for replying, is there any ways to avoid it or it just depends on your luck?

Best I can tell, no. If, like me, it bothers you to see it, you can click on the reputation and choose to move it to Inactive

I have the same issue. I raised a ticket about it but got no response. AFAIK its only a visual annoyance and doesn't affect anything.

there is no visual only. i was trying to take Loremaster of Northrend and some quests from storm peaks is not avalibable because of that. like Luxurious Gateway and When All Else Fails.