I think everybody here refers to coffee mugs as coffee cup in casual conversation. This is presumably what has lead to A LOT of mistags of images containing a coffee mug under coffee cup. As a result you will often see coffee mugs under disposable cup since the coffee cup tag does imply that other tag.
I am willing to go through all of these and tag them accordingly, the thing is that people would continue to mistag due to how ambiguous coffee cup is. I want to discuss a potential solution in this thread.