The person who raised the original point of this thread is mostly correct. although Some posters on this thread have questioned the robustness of their claims. So, I decided to do a brief review of the literature to illustrate that those views do have academic support.
Yes representation matters, for example, Dhoest, A., & Simons, N. (2011) stress the importance of positive representations for lesbians and gay men. Particularly at the time of coming out, sexual identity becomes salient in media uses and interpretations.
And stereotyping prevails in the representation of LGBTQ characters in the mainstream. A longitudinal study conducted by Nölke (2018) found that while the number of explicit representations of LGBT characters has risen dramatically in recent years, these representations were mostly stereotypical along the lines mentioned in the original post. Intersections of sexuality, class, age, and race generally remain invisible, which highlights they claim that the erasure of multiply marginalized groups continues to perpetuate a heteronormative, domesticized version of “gayness.”
This result was supported by a study by McInroy, L. B., & Craig (2018) who found that while lesbian, gay, bisexual, transgender, and queer (young people have been increasingly represented in traditional (offline) media over the past two decades, that traditional media (particularly television) to represent LGBTQ people as one-dimensional and stereotypical, ignoring many LGBTQ sub-groups.
References
Dhoest, A., & Simons, N. (2011). Questioning queer audiences: Exploring diversity in lesbian and gay men's media uses and readings. The handbook of gender, sex, and media, 260-276.
McInroy, L. B., & Craig, S. L. (2017). Perspectives of LGBTQ emerging adults on the depiction and impact of LGBTQ media representation. Journal of youth studies, 20(1), 32-46.
Nölke, A. I. (2018). Making diversity conform? An intersectional, longitudinal analysis of LGBT-specific mainstream media advertisements. Journal of homosexuality, 65(2), 224-255.