And the guy's mindset is it's flowers, that go in a vase.
What's in her head isn't in the head of the delivery guy (and we have no idea what's in the head of the boyfriend that sent them).
Furthermore, if that's what she thinks, that's all on her. Her thoughts are hers, no one else's. Only she controls what she thinks (like all of us). And before you say "her boyfriend made her think that" :
We have zero evidence of the boyfriend's behaviour from this comic, that would be a strawman.
Regardless of his behaviour, if she didn't like it, she should dump his ass.
I don't know a single woman who thinks like this (probably because I don't keep people like this in my life). If you (the royal you) let other people determine how you think or feel, only you are responsible for permitting that. This is Cognitive Behavioural Therapy step 1.
Also, it's a joke... About how all of us operate from assumptions that we'd be well served to revisit and reconcile with what others actually think .