^ Well then the boys need to learn to behave or accept the fact that they won’t be going on the field trip.
My D must have attended an ES on another planet. She was bored silly in math, but for 2 years every time I asked that she be tested to accelerate I was given a run around (in retrospect, I should have escalated it to the district administration). The handful of kids chosen to be moved up in math were with one exception all boys. When they finally tested every student in math what do you know? D was in the 99th percentile in math (as were some other girls). Oops! The school very quickly started accelerating these girls. The bright side was that from then on they began evaluating all of the students in math ability.
In another instance, each teacher was allowed to choose 4 student who were good writers for a specialized writing program. D was/is an excellent writer but her teacher chose 2 girls (not her) and 2 boys. When I questions the selection I was told it had to be “fair” to the boys.
S attended the same ES and was always given challenging work. I was repeatedly told how academically talented he is, the only feedback I got on my D was that she was “fine” and behaved well.
Based on my experiences I have a difficult time with the concept of elementary schools “favoring” girls.