Gay kids will be uplifted by learning that their sexual orientation need not hold them down. And straight kids will see that being gay is not bad. With gays and lesbians, it requires identification to know that. You don't just know it from a picture. Kuehl has got it backwards.
Discrimination is the act of mistreating an individual as a member of a group or class.
You don't end it by reinforcing group identity. You teach kids to treat everyone as an individual. You judge people by their actions, not their traits. The problem with group identity is that it cuts both ways. Of course not.