Writing to say thank you to the OP. Spent the last 2 days from 3:30 - 9 on hot, dusty fields. After a long day at work. This is my least favorite time of the year. Doing my best to assess too many players in too few reps (the cattle call). Sometimes for weak players that are struggling their way through a tryout their parents arranged. Sometimes finding players that are a better fit, and making the difficult decision to cut girls (and their families) we've spent 1-3 years with nights and weekends. The original post and DFP replies helped me work even harder to be polite, welcoming and considerate as I make difficult decisions.
As a parent I don't know that we could ask for more than "polite, welcoming and considerate". I have been on both sides of the tryout season, and neither one is easy.