If someone is subtly flirting with you, how do you subtly indicate that you're not interested ?

If it's subtle, I am unlikely to even notice

Flirting with me is like flirting with a brick wall. Not sure if that's subtle or not

Subtly show that you didnt notice.

"I appreciate you flirting, but actually I'm a machine"

Then copy/paste some random code you found on GitHub

That could be heading to a harassment charge. No subtlety tolerated these days, I'm afraid

I would by not entertaining it and just talking normally. They might give up after you seem oblivious to their flirts

just say "ha, ha, yeah" after everything he says lol or one word replies

Sorry. I haven't reach puperty yet *Disappeared*

Change subjects.

Just look away when he makes eye contact with you

I don't I'll flirt back

Don't exist in their eye frame is what works best for me.

Tell them that you have a scorching case of herpies.

Just tell them you have Dissociative Identity Disorder