The network, which is home to shows including 90210, Gossip Girl and The Vampire Diaries, received the highest ever rating for a broadcast network in the annual survey by the Gay And Lesbian Alliance Against Discrimination (GLAAD).
The Hollywood Reporter says that The CW, which has been in second place for three years, was marked 35% in the Network Responsibility Index.
Meanwhile, MTV was the first ever network to pick up an "excellent" grade in the survey.
GLAAD president Jarrett Barios said: "From their inception, MTV programmes like The Real World and America's Best Dance Crew have offered richly diverse portrayals of gay and transgender people that help Americans better understand and accept our community."
Elsewhere, Fox received a 30% mark but was rated 'adequate' because some of the representations were said to be derogatory. ABC was in third place with 26%, while NBC received 13%. CBS picked up the lowest score with only 7% of inclusive programming, largely from its reality shows.
On cable, ABC Family, TNT, Showtime, Lifetime and HBO all received good grades, but USA and A&E were both named as "failing". TBS received the lowest score with just 2%.
GLAAD analysed over 5,000 hours of primetime programming for the study.