Yeah, some people have a type, but you don't think that term implies condemnation of white women marrying/dating black men?
Like I said, I think the line is pretty hard to cross, but the term kinda equates black males generally with being underneath her (~rimshot~), which obviously isn't true.
A term like "Jungle fever" or "slumming it" is more situational, and is also lighthearted. But those are more in reference to one-night stands, casual relationships, things that might be seen more as living wildly or rebelliously. On the other hand, if this is a loving, family relationship, there is no need for aspersions.
And like I said, there is a difference between saying that any interracial marriage is per se bad, versus saying that there is a preference to marry within a single race/culture. The latter is understandable, if that's your preference, but denouncing all of the former seems more wrong.
That may not have been what you were going for, but that's why you got the reaction you got, even from people who are decidedly not PC.