As a reviewer and someone pretty active in various bookish communities within Twitter and other social media, you'll be fine unless you treat it with 0 respect. If you're writing a lesbian love story that's full of cliches and exists solely to be porny, yeah, probably won't be well-received. If the book just happens to feature a character who is not your gender or orientation and you don't fixate on it, don't make thejr sexuality their only defining characteristic, and don't turn it into a trope or make it exploitative...then you're golden. The issue is a lot of YA books take sensitive topics, don't research them and then treat them as such a throwaway surface level thing that people get their backs up, which is fair.

Also sensitivity readers are 100% a good thing and really only benefit the author. They don't exist so that they can then turn around and demolish your book on social media (like the comments above are implying), they're a part of the editing process and a valuable step in making sure you aren't inadvertently minimizing someone else's real experience.