Which angle would you like to look at it from?

Religious? Religions don’t universally condemn homosexuality, and even if they did, there is no reason to believe any one religion is actually right about it (or anything else).

Nature? The existence of animals that engage in homosexual relationships is well known, and there are even animals that display the behaviors of the opposite sex, so it’s not like there’s a single leg for bigots to stand on scientifically.

“Grooming” children? That’s not a thing with LGBTQ+ people. Sure you can find one or two examples here and there, but there’s no evidence that a statistically significant portion of LGBTQ+ people abuse children. In fact, the opposite is true. There is zero evidence at all that a statistically large proportion of abusers are LGBTQ+. So the revolting “groomer” accusations are literally just made-up, disgusting garbage, and the people making that up are doing so strictly to hurt people who haven’t hurt anyone else.

So yes, they are objectively wrong, by every conceivable measure.

But good luck convincing one. These are reality-challenged people, confidently asserting shit they know nothing about, and utterly impervious to learning that they are wrong.

Sometimes the only thing that actually can get through to someone like that is finding out their own beloved family members are gay. That sometimes works. But it’s like they can’t even conceptualize the idea that they’re wrong until it happens to them.