.
Well, it's not prejudice.
It's actively excluding someone due to their race.
That is part of the definition of the word prejudice...
Also, since when do creatures in element have a race? Maybe different species.... Maybe even different subspecies (unupped vs upped dragons etc) (to clarify subspecies does not mean race per say. Mixed "race" people show that race can't exist in a clearly defined, standardized way...)
The shield is extremely situational don't you think? (It is a shield right?) maybe it should at least block some damage or do something else?