First, welcome to the site. I've only been a member for a month or two, but i got the hang of it quickly. In my opinion, you should be here if you're in an IR relationship, curious about IR or just interested in meeting and getting to know black guys.
As for the "big deal" on interracial in the US, I can only tell you that some people are into it and some aren't. Usually the older generation (white, black or other) aren't because they grew up in an era of segregation or simply an area of the country where such a thing just wasn't permitted out in the open. But the newer, younger generation of people here are more open to it because many of us view other cultures as just other people with something different to offer. Now personally, I do think it's tough still to be in an IR relationship depending on where one lives in this country, but I'm not convinced it's supposed to be easy considering this country's ugly history.
I know my explanations may seem vague, but there will be other unique replies to your topic shortly. But again, welcome to the forum.
Kenneth