It’s a valid and moderately common construction. This is called the generic (or indefinite) form of you. It’s primarily used as a colloquial or less formal substitute for one.
But yes, you do have to infer whom you is referencing from the context, so I could see why some might find it more confusing.
The “you” in the 3rd panel refers to the hypothetical shop owner referenced in the 2nd panel, not the dude she’s talking with.
It is a confusing way to frame a sentence though, saying “you” in the context of an acted out conversation with someone who isn’t there
It’s a valid and moderately common construction. This is called the generic (or indefinite) form of you. It’s primarily used as a colloquial or less formal substitute for one.
But yes, you do have to infer whom you is referencing from the context, so I could see why some might find it more confusing.