In the examples you have, I don't think I would have a problem. I might have obstruction or interference if a player was yelling things like, "foul ball" or "time" or other words reserved for the umpire.
In your example of "strike", I don't see this as a problem because I'm presuming the PU calls it after delivery. (First base coaches seem to yell "safe" a lot also.) If it gets too out of hand I might ask them to knock it off.
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Dan
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