The other poster is even more subtle and forceful. There are at least two serious problems with this public morality statement. One is that it puts homosexuality in the same category with gender and race. The endorsement is implicit and subtle, but very real and very powerful. The other problem with this poster is that it bases respect on what one doesn't see instead of what one does see.
Respect sees no color, gender, etc.
The result is that the positive foundation of respect is missing and there is no wonder that students see little reason for it. No reason has been given. The first ground of respect is that every person has been created in the image of God, no matter what. So you can even have a kind of respect for a murderer, by holding him accountable and punishing him, unlike you would do with a snake if it killed a man. But in every day life there are different degrees and different kinds of respect, and these are emphatically based on what we see.