Table talk usually does occur when someone takes the exact spot that another player was going to use. Or blocks the spot inadvertantly by placing a tile adjacent to it. We've had some heated "table talk".
Yes, usually when a family member makes a play but misses an opportunity for a really good placement, I can't help myself and I say something like "Oooh, I know a really good spot for that one." I usually only do that if it helps them against me, otherwise other players get upset. But I can't help coaching.
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