I agree with Tylanas. Kids can't be gay or straight, because these terms have to do with sexual urges, which kids can't feel until puberty.
What flurries is talking about, a boy playing in a girly way, that is not quite the same thing.
Yes, there is a chance the boy will be gay later in life, but there is also a chance that he won't.
What he is though is effeminate. He is a male who happens to enjoy the more feminine things. Some males are this way and are sexually attracted to women, and some are sexually attracted to males, or to both sexes.
Me myself have no problem with this, I think that as long as a person is not harming anyone or themselves, then they should be free to enjoy themselves.
I think though a parent or grownup who does make a big deal about a boy being effeminate will only make the boy feel ashamed for enjoying the things he enjoys, which in effect could cause problems and resentments in the parent-child relationship, and also could cause some life-damaging psychoses in later life.