Why is instant coffee hated so much even though it’s not terrible?

It’s definitely not the cream-of-the-crop, but when you’re limited on time and need a quick pick me up, I think it’s lightyears ahead of anything that ever came from a Keurig, or that shitty coffee served at some restaurants, just ask for hot water instead and add your instant, problem solved.

I will add, it definitely depends on brand, any generic ones will likely taste watery, I go for Nescafé or Starbucks.

Why, at least in the US, is it hated so much, when it’s pretty convenient?