It's reasonable to not want to hear a slur in entertainment meant to be lighthearted and positive representation. Times change. I think it's really dismissive to say "first world problems" about pointing out that some people will be hurt by the use of a slur, particularly from someone who does not actually belong to the LGBT community.

"People need words that express how they feel" - this is a movie, where everything was a choice made by the writer/director. My review simply points out that certain parts of the script are outdated with homophobic language. If I recommend a movie that says the N-word, I'll point that out to, along with its context: a white person saying it as a slur is different than a black person reclaiming it, just as a movie set in the 1980s will use language differently than one set in the 1880s.