Another one: https://www.voanews.com/a/new-information-emerges-on-trump-shooting-suspect/7697793.html

Kohler said he never had much interaction with Crooks, who noted would sit alone during lunch and often was targeted by other kids for the way he often wore hunting outfits or how he continued to wear a mask after COVID mask mandates ended.

“You could look at him and you would be like, 'something's a little off,’” Kohler observed.

Kohler is probably one the bullies. The other people interviewed didn't seem to be aware of him getting bullied and it's not something you'd really know so confidently unless you were part of the group doing the bullying.