Not that it needs to be beaten over anyone's head in here, but I take it as an assumption on their part that it's a certainty I will win the rack from that point. Think context of game play is the unknown variable here. Lets just assume that I know the situations I lived through better than anyone in this forum.Maybe because “there you go” means “I screwed up, now it’s your turn” to most everyone? I’ve never run into anyone who considers it a concession, and I’d never take it that way.

When does the line get crossed from simply moving forward to what appears as a deliberate move for concession...? I suppose one needs to stop the act of shooting and wait to see if the hand starts coming out...?I think Chris is talking about approaching the table in a deliberate move to concede, either ending in a handshake or starting to rack. That’s the style of concession I see most commonly in casual money games.
In my experience there's an older generation of players that hover around the table during opponent play. ...and I don't doubt they're completely naive to how their actions can be perceived as either unsportsmanlike or a possible concession. My point is, you need to judge your audience..., so to speak. I have had league players break their cues apart during matches and I don't claim victory. I simply point out to them what that would normally signify and ask if that's their intention.
I know there's a breed player that will jump at the opportunity to get a free shot, game, set or whatever based on perception of concession. I'm not judging, I'm just saying that far more often or not these situations can be learning experiences for the uninitiated. So I default to that rather taking the advantage.