"This thing that medical professionals say is real isn't real, and you can tell that because astrology isn't real either".

The reality is that, for a lot of people, their struggles aren't "their fault". People with visual disabilities aren't as good at playing darts, people who have issues with gross motor skills aren't as good at baseball. That's all accepted, but as soon as you get into invisible disabilities everyone leaps to say "I can't see it so it doesn't exist". It's a load of BS, and it's why so many people who do have these issues struggle - because they're being told, by people who don't care to understand what they're going through, that it's all their fault because they're just shitty people who need to try harder.

One of the things that people spouting nonsense like yours seem to miss is that these issues that people with ADHD have aren't just laziness; it's not just "I don't want to do work". People will find it impossible to do anything, even things they enjoy. It's not just slacking off from chores and playing video games instead, it's not being able to bring yourself to do chores but also not being able to bring yourself to play video games, or read a book, or go get groceries. It's a fundamental inability for you to direct your executive function, and until people like you stop spouting uneducated nonsense and start actually listening to people's experience it's going to continue to be an uphill struggle for people who have to go through what you're dismissing.