Like I said, to each their own.
To me it is grating at that level (high school age or older). If someone is doing more than yelling out a little encouragement or clapping for a hit (or whatever) almost without fail they are complaining about the blue screwing them over or whatever. Again, I am sure many have had other experiences.
The onus of me changing came from my son. I would yell out encouragement (and occasionally instruction) during games and it drove him nuts. He finally said, about sophmore year of HS, "Just be quiet. If I made a bad pitch I know it, if I made a good play I know it. Its irritating."
So, I stopped. For me, just me, it made the game much more enjoyable.
I never gave instruction, god knows he did not need it from me. I would comment on a good pitch but would not call him out by name. I asked my son if any of it bothered him. He said "Frankly Dad, I don't hear you."
I root for our side but also recognize if an opposing player makes a good play/pitch. Like BBallman says, it is just part of the game for me.
Pretty similar to me actually. I don't want it to seem like I am sitting there like Weekend At Bernies. I will clap a little or certainly acknowledge a good play by either team.
The giving instruction part is embarrassing in hindsight. That is why I brought it up. My son had the opposite reaction he only heard me.