Max, trayvon, and the rest of the boys in the first-grade class have decided that from now on, boys will only play with boys and never with girls. what are these students demonstrating?

These students are demonstrating gender segregation in which an individual is likely to enforce or decide of having to separate with other genders. This could be seen above as boys does not want to play with the other gender which are the girls and prefer to play with themselves alone.