He's behind you!
Oh no he's not!
Oh yes he is!
Surely the definition of the word is not the point.
If a word is used in the wrong context the semantics are meaningless.
(Can I say that: "semantics are meaningless"?)
Apologist - A person who argues in defense or justification of something, such as a doctrine, policy, or institution.(http://www.thefreedictionary.com/apologist)
Therefore more applicable to racists. Anti-racism is against a doctrine or policy, i.e. racism.
a person who offers a defence by argument.
Only applicable to anti-racists as racists have no reason or argument to offer.
a person who defends an idea, faith, cause, or institution.
Applicable to both, perhaps.
a person who defends, in speech or writing, a faith, doctrine, idea, or action.
Applicable to both.
Or:
apologist - a person who argues to defend or justify some policy or institution; "an apologist for capital punishment" or "an apologist for racism"
On this basis the word is more applicable to racists than to anti-racists.
Oh dear, another of their silly ideas blown clean out of the water.