These people afflicted with the disease are often called "Trolls".
Everyday Bob: Yes, I did vote for Obama.
Internet Bob: Fuck no, i didn't vote in that bitchass communist porch monkey! However, I did fuck his wife!
Everyday Bob: That girl is very appealing to the eye!
Internet Bob: *fap*fap*fap*
Everday Bob: That's an interesting point of view.
Interent Bob: Fuck you, you commie homo!
Everyday Bob: *joining in an engaging conversation, and staying on topic*
Internet Bob: Who else wants to have intercourse with Jessica Biel.