Sorry I don't agree with you.
If you're against any sexual propaganda targeting minors, then why have a law specifically targeting homosexual propaganda? The only reason is to single out homosexuals as a group for discriminatory treatment.
Secondly, pretty much every show on TV, every song on the radio, every movie involves people talking about their sexual preferences. Nobody considers it shameful when a man says "this is my girlfriend and I want to marry her" but if he says "this is my boyfriend and I want to marry him" why should that be shameful? And even if you do consider it shameful, why does that mean it should be a criminal act? Again, it's a discriminatory law, taking rights away from homosexuals.
That's what people are objecting to, the fact that discriminates against a group of people and reduces their rights.