I think interracial relationships are perfectly fine with these exceptions:
-People who dislike their own race that strongly so that they date outside of their own race
-People with racial fetishes, like dating East Asian, black, Latina, white, etc. I've known people to disregard their own race because interracial dating is cool and date interracially for the sake of it. I think it's creepy, because a person is so much more than a skin color or ethnic identity. I can understand wanting to date someone of your ethnic background, if you're seeking someone similar, but to date someone because you think it would be so cool to date an Arab/black person/Jew/East Asian/etc. is so incredibly dumb and offensive.
-People who date/procreate interracially in hopes of better looking kids. I don't agree with the statement that biracial people are better looking. I've known many and while some are absolutely gorgeous, others are not. There's no huge difference in how people look. I think one of my friends said it best: if two ugly people are having kids, no matter what race they are, the kids are going to be ugly. Of course, they may be beautiful on the inside, but they may not physically be attractive at first look.
I've heard about the first one but have actually known people who hold the last two. I think you should date whomever you are most compatible with and race isn't going to determine that..