Hey, no need to get all up in arms over this (pun intended haha). I was just trying to provide some information that might help out folks who may not have known to take those items out of their bag and carry them as an alternative to setting off the detectors.
If I may, if I were in your situation, this is what I would do. First, I have only ever visited the parks alone once, so I am almost always with someone else and we can more easily divide our items/bags. What I would do if we had quite a few items that could set off the detectors, I would put them all in a clear ziploc bag (except for the water bottle, I would carry that separately for fear of leaking in the bag) and hold the bag and water bottle out in front of me as I went through the detectors. I might still set off the detectors because of those items, but having them all in a clear bag should help expedite the search process. In this situation, I would also make sure that I am not the one carrying our park bag so that the only things they will need to check will be my person and the clear bag as opposed to our backpack as well. Plus, the clear ziploc can be easily unpacked and folded up into our backpack so that it isn't in the way the rest of the day.
Again, I am just trying to throw out ideas to hopefully prevent the dreaded beep and being asked to step aside to have a security person go through your stuff. Is there a sadder sight than having all but one person in your group make it through security and watching them wait to be wanded and the bag searched?