In your mind he was supposed to be nonpartisan, but obviously he was not, and he even was displaying the sticker to show that. He left because you were acting strange and he needed to sign up more people for Hillary, not jibber-jabber with you about his little sticker.
I call BS on your responses. If he knew he wasn’t partisan, he would have admitted to working for or in support of voter registration/gotv for Hillary.
Instead, he hightailed it out of there.