Nowhere does it say he followed her trough a store, or that she ever entered the store.

“DiGuglielmo inexplicably abandoned his car in the through lane of travel" and went into the store, before shortly returning to his vehicle”

It is definitely possible that he is a racist, i honestly do get the same vibe. But where just reading a barebones article with many unanswered questions. Making suck assumption is very easy from where we stand.