infosume

to assume other people know something just because you know it or because you have seen a lot about it on the internet

"She infosumes people know things because there was a lot of discussion about it on twitter, even though most people don't use twitter."

"How do you not know that? It's all over the internet and gets brought up in this group regularly!"
"I am 13 years old and just joined this group an hour ago. Don't infosume."

shreve weaver

a shreve weaver is someone who derails or undermines another person by quibbling over semantics or shifting the focus of the conversation to an inaccuracy in an off-hand or tongue-in-cheek remark that has no relevance to the initial topic

"When I asked him to call 911 because my boyfriend shot a gun at me, the shreve weaver replied 'You mean he *fired* a gun at you.'"