What to do when the ask you to take a picture of them early in the set?

At first I thought it was a harmless request. But I'm starting to feel this is an indicator of something quite not right with the vibe I'm putting off, or she's making some assumptions that quite isn't right. 

She's interrupting the flow the interaction. And it also means their RAS was on something else rather than enjoying my company. 

If they makes that request, I just want to leave the set because we aren't on the same page. But, she just doesn't know me well enough. But, the real me doesn't want to take the picture. 

I was thinking, what does the real me want to do in this situation. I came up with a few responces:

Passive responce 

*nuertral facial expresion* 'maybe later' then *plow forward*' OR a slight takeaway and check my phone then reingage the set

Slight enforcement of boundaries

*disapproving facial expression* 'nah I won't be doing that. Anyways' plow forward

subcommunication of bad behaviors 

*flash of disgust facial expression* 'uhhh, anyways'. 

direct communication of bad behavior

'just you two, and you don't even invite me to the picture. Rude!' . This may subcommunicate needynes though, because you're technically asking to join a 'party' of theirs. 

What do you guys do in this situation?