Why this guy look at me in the classroom?

So this guy look at me all the time in the classroom, my friend told me that he was looking at me and she told me that he's racist and he hates arabs people in general, but the problem is that he only look at me even though there's many arabs in the classroom its not only me, I never talked to him before and I did nothing wrong to him, I remmeber once I passed by him and he looked at me from up to down like he was judging me or something, I don't even wear Hijab or Abaya my clothes are just normal just like anybody else, this guy is actuatly from brazil and he's christian, but I know that Brazilians people aren't racist and they are very kind people, I don't know what's wrong with him...

Why this guy look at me in the classroom?
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