Why do yaoi/yuri(bl/gl) subreddits are so sensitive?

Last week I was reading a manga about a poly relationship about a guy who got into a relationship between a lesbian couple so I was curious and asked on the gl subreddit if the manga I read still counts as a gl, and the mods bombarded me with a deleted post saying "your post was deleted due to discrimination". I just politely asked if the series was still a gl I didn't know you can get discriminated by a simple and curious question and it's not like the people who saw my post hated my question they genuinely commented their opinions about it. Anyways this also applies to other sub reddit mods, they abuse their authority since they can't do it in real life.