[just another ref]

Like a lot of other things we could mention, I see this as something that would really have to be taken to an extreme to justify the T. Staring by definition is an act, but one of a passive nature. (to gaze at steadily and intently) If that's all that there is to it, a stare not accompanied by gestures or mumbling, (G rated version: no good homer, make up calling peckerwood, visually impaired nitwit) where this stare takes place now becomes the key.
If he stands in his huddle and looks in my direction, I got nothing. If he walks across the court and puts his face six inches from mine and stares I whack him. For anything in between it's like the old live Jimmy Buffett album, "You Had to Be There," and I think each of us must draw his own line of how much is too much.