Not everybody knows you shouldn’t fill up your hard drive completely. If someone doesn’t explicitly mention it, its safer to assume they don’t know so that you don’t accidentally give them advice that harms their drive. And no, saying play space instead of space (especially when your title just says 20 gb left) does not count as explicitly mentioning it. You never mention having room to spare or even knowing the difference.

It’s clear now that you probably do, so all you needed to do was say “don’t worry I know” or even just ignore the advice entirely. I don’t know why you’re being annoyed by people for not having the info you failed to provide them.