Susie is advocating a normal, life-affirming way of life. The homosexual club is promoting a deadly, perverted, anti-family way of life. I would also say that schools should not promote lifestyles which exclude an entire sex, which the intolerant homosexual lifestyle does. It is a vile, exclusive, hateful lifestyle.
Homosexuality teaching in school curriculum also undermines the religious teaching of the children's parents. That alone should cause parents to sue schools for interfering with their rights to teach religious absolutes to their children.
So you want the schools to give preferential treatment to your view of life (which isn't shared by all people).
Conservatives aren't the only ones good at talking about values. Schools can just as easily shut down anti-gay viewpoints by making moral arguments (on the grounds that gay-bashing is not "life-affirming"). If you think schools can ban pro-gay clubs, you have to accept that other schools will ban anti-gay clubs (unless what you really want is your set of values imposed on the entire nation--good luck trying to do that!)
I would also say that schools should not promote lifestyles which exclude an entire sex
Okay, we'll start by making it illegal to discuss priesthood or joining a nunnery. Who says the gay lifestyle excludes any sex? There are gay men and gay women. There are bisexuals who are more inclusive than homo- or heterosexuals. There are "fag hags" (straight women who hang out with gay men). Most gay men probably interact with more women than the average straight man does or wants to.
Homosexuality teaching in school curriculum also undermines the religious teaching of the children's parents. That alone should cause parents to sue schools for interfering with their rights to teach religious absolutes to their children.
Some parents want to teach their kids the world is flat, others want to teach that homsexuality is a sin, and still others yet want to teach that blacks are subhuman. Sorry, but the fact that public schools teach stuff (which someone, somewhere, objects to) is not a violation. If it was, schools couldn't teach anything.