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Summarize the negative points from this article.

This is the article: When "Glee" first premiered in 2009, it was groundbreaking for its largely teenage demographic. Due to the frequent LGBTQ+ storylines the show tackled and the heavy musical content, the show quickly became a haven for theater nerds and outcasts around the world. Throughout its six seasons on the air, "Glee" taught an entire generation to follow their dreams in the face of judgment and cruelty. The series helped set the tone for normalizing more diverse storylines regarding gender and sexual orientation. Unfortunately, many of the show's plotlines are also tinged with racism, homophobia, and ableism, all while frequently taking feminism back 15 steps in any given episode.

The school setting of "Glee" provided a great opportunity to address these problems as the show continued, but it repeatedly failed to do so over the course of its initial TV run. The teachers are often worse than the students, and any character development that the McKinley High School crew manage is almost immediately retconned, leading to a repetitive slate of character arcs and a lot of unaddressed problematic content. Here are some of the big issues we should probably stop ignoring about "Glee."
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Glee frequently had plotlines that attempted to address societal issues, but ultimately failed. This meant the show ended up having elements of racism, homophobia, ableism, and sexism. In the show, the teachers set a worse example than the students, and character development was wiped away quickly which left the show with repetitive characters and unaddressed problems.