Don't quote me, but statistically, I believe the lesbian lifestyle is not as harmful, as in, their life expectancy is not well below average, though it's still obviously a deviation.
Yes, my view that it's not healthy to paint homosexuality as something positive to children because it's not something positive. It's an abnormality, by definition. I also don't think we should present incest to children as positive, or transgenderism, or depression, or OCD, even if these things are okay for adults to do/be.
Heterosexuality is the norm. There will come a day when children learn that there are deviations in life, but when they're 9 years old watching cartoons, it's not one of those times.