You can, and it's amusing to see the reactions on those around you when you order something like black coffee, black coldbrew, or you get one of those tea lemonades and state explicitly no sweetener. It's as though you are committing a cardinal sin, when in reality it's all these sugar and cream addicted butthuffers that dishonor all things coffee and tea. Unfortunately, due to how often they have to dose these things with additives for the pleasure of obeasts and mini-moons you really have to check your stuff before leaving. Some of them I swear do it on purpose because they are fat baristas (teehee), and others because they are so used to adding additives that it's automatic processing almost. A fat whale that could barely fit in the area behind the counter screwed my order up, and I made her fix it. As I was leaving she started grumbling to her mini-moon co-horker about how it's not that big of a deal to add a little sugar. So I walked back, looked her dead in the eye and asked her "Do you want to be held responsible when a diabetic or someone with some other condition sensitive to sugar ends up in the hospital because you tried to slip sugar into their drink when they requested no sweetener?" She just let her mouth hang, and I repeated louder "Do you? You think it doesn't matter when you could kill someone or hospitalize them?". Then I left. Funny thing is, since then I've never seen her at that location again, or any other for that matter. No I'm not diabetic, but my family has a predisposition towards in, and I really hate sugar in my coffee or tea. I don't like sweet drinks. I also do have odd issues if I consume too much refined sugar. I'm lucky it won't hospitalize me, but others may not be so fortunate. I will light a person up verbally if they pull that shit with me and I have reasonable suspicion it was on purpose. Just because I am just shy of a 100 pounds doesn't make it okay to fuck with my food/drink because you are a glutton.