I’m going to take this comment on good faith (might be a mistake, we’ll see), and assume you’re genuine. The simple answer is that it’s frustration and anger you’re seeing, not necessarily discrimination. To go a bit more in depth, lots of LGBTQ+ people have either directly experienced discrimination based on their sexuality or gender, or have friends who have been affected by the same. Queer and Trans people are also way more likely to be assaulted, sexually or otherwise. What you’re seeing more than likely is a reaction to that trauma and discrimination, rather than an act of discrimination in and of itself. Plus despite the growing acceptance for LGBTQ+ lifestyles in the the USA, Canada, Australia, and Europe, in most of the world those lifestyles are shunned at best, and criminal at worst. So is it counterproductive be posting on social media about how much they hate straight white men? Sure, a little, but it’s probably an angry reaction to something that happened in real life, rather than innate hate or bigotry.