I don't know... As someone who is also gay, I actually found the topic in the last episode to be dealt with quite well.
What Robin tells Will, how she had a crush on someone who was heterosexual and the reasons why she was afraid of coming out, fits 1:1 to my own story.
What was a bit unrealistic in my opinion was the fact that all the people who are currently playing a role in Will's life were present in that moment.
Usually, you first tell ONE person, your best friend or a family member. Because as Stranger Things rightly says, your biggest fear is that people will reject you from that moment on and you'll end up all alone. That's why you "test" it on the person who means the most to you. If they take it well, the rest is (almost) no problem.
But on the whole, I felt very well represented by Will, as I said, as a gay man whose story is very similar to his.