Is it biased or wrong not to trust African men?

I'm from USA and I have had some bad encounters with African men. Most if not all of them who contact me out of interest are very... eager. They rush to try to get my number, they rush to talk about marriage, they rush to say "I love you" and I don't even know them. I'm not into the intergeographical dating either. I have too much going on for that. Plus, it makes me think they need a green card or something. AM I wrong for that?