For anyone wondering just how long this has been going on, she posted an essay on her site in 2010 she said she wrote in 2006 (meaning while she was in college) and it was rife with stolen material. Her essay "Real American Horror: The Family Falls Apart in Tobe Hooper's THE FUNHOUSE and THE TEXAS CHAINSAW MASSACRE" lifts huge sections from Bradley P. Guillory's "Stained Lens: Style as Cultural Signifier in Seventies Horror Films." Examples below.

Her:

After he mentions that he was coming from the slaughterhouse, Franklin asks the Hitchhiker questions about the new methods of cattle slaughtering and mentions that his uncle used to work for the slaughterhouse; Franklin had also mentioned earlier in the film that he and Sally’s grandfather used to sell cattle to the slaughterhouse. The Hitchhiker says he doesn’t work at the slaughterhouse, but his whole family once worked there; he states, "My family has always been in meat." The Hitchhiker then comments about the new, inefficient method of killing cattle; he asserts that the cows die faster the old way, and the new way puts people—like the cannibal family—out of work. The Hitchhiker inexplicably grabs Franklin’s knife and begins to slowly slice into his own left palm. The group of young people are horrified. One cannot blame them for rejecting the Hitchhiker's invitation to eat dinner with his family; the Hitchhiker does bring this up again when Marilyn is caught by his brother. The Hitchhiker pulls the bag over her head and begins to laugh and poke at her as he yells, "I thought you were in a hurry?" Not accepting the Hitchhiker's invitation is an unhealthy addition to his family’s history of rejection. This is where Franklin becomes closer to the family because he has apparently also felt rejection because of his disability, for Franklin is very envious and angry when everyone giggles with excitement on the second floor of his grandfather’s abandoned house because no one offered to help him up the stairs. In observing this rejection of the cannibal family, one cannot help but wonder if all five of the young adults would have survived if they had simply agreed to dine with the Hitchhiker and his family.

Guillory:

After the Hitchhiker mentions he was coming from the slaughterhouse, Franklin asks the Hitchhiker questions about the new methods of cattle slaughtering and mentions that his uncle used to work for the slaughterhouse; Franklin mentions earlier in the film that he and Sally’s grandfather used to sell cattle to the slaughterhouse as well. These statements about Franklin and Sally’s family blur the lines between good and evil. Although the Hitchhiker and his family are repulsive and cannibalistic, it is only because their jobs and means of funding were ripped away from them and they have resulted to cannibalism as a result. Perhaps if Sally and Franklin’s family were unable to get jobs after the slaughterhouse, they would have met the same fate. The Hitchhiker says he does not work at the slaughterhouse, but his whole family once worked there. He then comments about the new, ineffiecent method of killing the cattle, he asserts that the cows die faster the old way, and the new way puts people (like his family) out of work. The Hitchhiker inexplicably grabs Franklin’s knife and begins to slowly slice into his own left palm. He is obviously insane. The Hitchhiker invites the teenagers to dinner at his house, and they refuse. Not accepting the Hitchhiker’s invitation is an unhealthy addition to his family’s history of rejection. In this sense, the character of Franklin becomes closer to the cannibal family because he also feels rejection throughout the film because of his disability. He often gets jealous, angry and frustrated at the others for not helping him or staying with him while he is stuck in a wheelchair. The character of Franklin and the cannibal family in relation to the definitions of normality and monster are almost reversed at certain times during the film.