Ranting here so I won't complain to anyone in person.

...My friends said that this creep has been pacing back and forth in front of my classroom, probably waiting for me to pass by.

It was "confirmed" because when I arrived, he said hi and then went away. And then came back to annoy my other friend whom he targets.

Ugh, I was thinking I didn't have to deal with him since I took a different route... and I was in a good mood 'til I saw his face.