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I definitely think it can be "too diverse", because ticking every box in the diversity matrix may feel forced and distract from the story itself.

Diversity should not be gratuitous. If the story is ABOUT the trials and tribulations of a whole homosexual community, that may be a lot of diversity. They are banding together to defend themselves, to protest, to demand police protection, to be able to exercise their rights. 

Or we may write a story about one gay girl in the 1950's coming of age, alone and lonely, surrounded by (for all she can tell) a vast sea of perfectly straight people, not a single gay person in sight.

For the lone lesbian, a lack of diversity is necessary to her story, if she is surrounded by lesbians she has far less angst or worry about it. She has advice, role models, anti-role models, plenty of help to find her place in the world. She doesn't have to hide her sexual self, or wonder if she will ever meet a girl like herself.

The same thing goes for race, religion, etc. In my own stories, I don't even mention it unless it matters, or explains something.

Don't make diversity gratuitous. It's true 10% of people are homosexual, and some are bisexual, or polyamorous, whatever. This DOES matter in some of my stories, but that is because I make it matter; I don't write a gay character without making a reason their sexual orientation matters to the story. Or a person of color, for that matter. 

I don't specify the race of any character. If you want to guess that my character fluent in Spanish is Hispanic, go ahead, but I never told you that.

Same for a homosexual: If my female protagonist kisses her girlfriend goodbye in the morning, assume what you want.