Why does he stop talking and stares when I walk in?

Anonymous
I noticed a guy in my lab he sits in the back with his friends, and I always arrive early so there is hardly like 15 people in there when I arrive. And whenever I walk in him and his friend stop talking and stare at me every time. And when I got paired with the guy that stares at me his friends all looked at each other and started laughing and messing around saying jokes. Is this bad does it mean they perhaps were talking bad about which is why they stare and we’re laughing.
Why does he stop talking and stares when I walk in?
2 Opinion