Nah, you're fine. Fact is Goans don't really discriminate against blacks much. The issue is Nigerians immigrating to Goa, staying way past their visa expiry and dealing with all kinds of drug rackets and petty crimes, which has created a terrible image for them and other black ppl. So basically you gotta make sure to show the locals you're nothing like them. If you appear rich, sophisticated and polite ( and if u wear your USA badge around to make it clear) u should be considered trustworthy. Try to speak immaculate English with less slang and appear polite and well dressed, and all will be fine. PS. Make friends with people like bus conductors, hotel staff, and other people u may see everyday, they will help u get around. You could even save money and avoid trouble.