In any part of the world, bad & good people exist. It's really as simple as that. We shouldn't focus on it & overthink about it. Doesn't matter where we are, there's always a possibility that someone rob us, attack us or harm us, all kind of people exist & we never know what would happen in every minute that we're walking around. But should we be ready for such a thing ? No, life is more precious than these negativities, you shouldn't let the thought of some bad people, bad actions or negative words stop you from progressing in life. You have to follow your dreams & go to achieve your goals. So drop these negatives & keep going forward.
But also i would like to mention some point, i really respect all the religions. So i would request you to not make my meaning in a wrong way. I don't know you so surely i won't judge. But (beside some bad people might exist, which you shouldn't care about them, & ignore those losers) it's totally up to yourself as well.
-Try to gather some information about the place you're suppose to go. I'm not asking you to find other cultures. Be yourself, but when you suppose to live somewhere even for a very short time, you need to know where are you going, what it's culture represents & being able to cope with your environment.
-Some Muslim people come here, they find problem because of their own behavior, keep your belief to yourself, don't try to invite others into your religion, don't connect everything with Islam, don't give speeches about Islam & don't be rude about the culture you suppose to live in, don't react strangely & don't question American's lifestyles or belief, you should cope yourself with America not to try to change America with your own believes. Don't pray loudly in Arabic in education environment, you might face atheists,agnostic, or Christians or even Muslims there, it's a free country, you need to be prepared to face any type of belief so you need to face it with acceptance without trying to be a guide for Americans like you wanna save them. If you see something that would be inappropriate for you, (for instance shaking hands with a guy) decline it respectfully,don't act harsh & mind your own business. (I said those because it has been examples that i've seen) so please just be yourself & act nice so you'll find so many great friends in a very quick time.
-If America would have problem with Muslims, there wouldn't be Mosque in different areas of the United States & so many Muslims go there & pray by their own beliefs. It is literally a free country. It is always "some" group of people who fighting over nothing. It's not about all. If U.S would have problem with Muslims, you wouldn't have scholarship from the first place. So you should be comfortable, just avoid (those type of ignorance people) (behave nice) & you'll be fine.
Don't let these things ruin your goals. Go there & reach it. Wish you best of luck.