It's racist to believe that another race is somehow inferior based solely on their skin color or features.
No.
It's not racist to have a preference.
Most black women who only want to date black men don't do so because they feel white men are inferior. They do it because they are naturally attracted to them. It's natural to be attracted to someone with similar pheno-genotypes. It's natural to be attracted to the familiar (skin tones, features, cultural similarities), etc. It's natural to want to be with someone that you feel can really "get" you and to many black women only a black man fits that bill.
In a perfect world IR's would be no big deal but the world is far far far from perfect. IR's should be considered carefully is because of the difficulties experienced due to others having a hard time accepting them. Many IR's experience discrimination and ridicule, sometimes even from their own families.
Some IR's experience difficulties when their children have skin tones of different shades from the parents and/or siblings. (I've been there). Not everyone can handle those issues. And some who could just don't see the need to when there are plenty of elligible handsome black men to pick from.
That said, A person should be judged by his or her character, not by skin color. I'm not God but if I prayed for a man to come into my life and a white man showed up (this happened actually) who was all the things I had asked God for but came in the wrong "package" - I would not block my blessing. I would probably ask "why"? and I did.
I know a lot of people assume I just love all white men everywhere and that they are the epitome of men but I actually had a difficult time getting used to being with my current SO. I had my own issues. At one point I really was perturbed by his piercing blue eyes. Hard to explain. They just weren't "familiar" and I was more comfortable with someone who looked like me. But, I got over it and I love him now and I'm glad it happened that way. Now I love his blue eyes.
Not telling you to get over it but not everyone who is married to a white man started off seeking them out.
Just be careful not to show favoritism to some, nor be prejudiced or racial to others. It doesn't sound like you are. A Christian man or woman's standard for selecting a mate should always be to find out if the person they are interested in is a Christian (2 Corinthians 6:14), someone who is born again by faith in Jesus Christ (John 3:3-5). Faith in Christ, not skin color, is the Biblical standard for choosing a spouse. Interracial marriage is not a matter of right or wrong, but of wisdom, discernment, and prayer.