Cringeposting

Cringeposting is the act of re-posting or sharing fanworks (or sometimes copying a fan's words) on social media without the original creator's permission for the intent to inflict humiliation on the creator, either through mockery or through public shaming. The original creator is often either not credited for their work, or their information is used for humiliation/shaming purposes. It is also occasionally used for shock value, intending to offend and upset users. This reposted material will often described as a 'meme', allowing it to be widely shared without guilt. It is an expression of Cringe Culture, and the content shared is naturally considered Cringe.
The two most common forms of 'cringeposting' are:
*Portraying the content as a meme and funny for being odd or abnormal, often taking a form similar to mockery. The same image or copypasta may be reposted incessantly and/or slightly modified to continue driving the point home, often without further comment. Responses to pointing out it may be stolen artwork will be justified by its memetic nature. 
*Portraying the content as highly dangerous, with the user claiming their intent is to draw attention and 'warn others' about the content they are sharing, despite its shameful nature, eg, expressing disbelief that a problematic ship exists and then posting images of it in a server. The reposter will pretend their motivation is to 'protect' others from the content they are sharing.
Often in either case, it will be accompanied by the reposter questioning why it exists in a humorous way, stressing the perceived deviant nature of the original work.
Both of these forms are powerful and persuasive, compelling users to spread the content further in an effort to either make other users laugh, or by compelling them to share it to 'warn' others. This often allows the content to travel much further and reach more users than by 'legitimate' means. For example, Kyle in Chains is a common subject of cringeposting, allowing it to build up a sizable enough number of reviews to attract further readers curious about it's perceived popularity, including more casual fans, creating a feedback loop, while fanfiction that is not 'cringe' attracts considerably less attention in comparison.
If the work successfully becomes a meme in the community, users may begin to create derivative work and deliberate variations, as happened with the Facebook Transphobia Copypasta or the Sup Jew meme in 2022. These will either imitate or stress the original work's problematic nature or transform it into something less disruptive.
The true motivation of such practices is often a avoid a sense of 'secondhand embarrassment' relating to being in the same community as the original poster, as is commonly expressed in the Official South Park Discord by users who post "cringe" material, to signal the virtue of the reposter that they do not participate or condone such behavior and to feel themselves better by drawing a contrast between them and the content, separating themselves from other fans in the process to their benefit. It is also often done by users who enjoy such cringe content as a way to clear suspicion around themselves or justify their behavior, continuing to post the same art "ironically" but with a similar level of obsession to those who favor it. In the 2020s, it has also increasingly become a way for social media users to gain clout and popularity, especially on Tiktok and Twitter, building entire accounts around re-sharing "cringe content".
As an extension of Cringe Culture, the practice is commonly criticized for criminalizing and mocking content from young or autistic fans that is harmless and does not harm real people, and furthermore in regards to cringeposting on Twitter and Discord, which are less controlled, it is often criticized for rarely adding any essential value to conversation to begin with. It is also often pointed out that if the content is as disturbing or inappropriate as claimed, it should not be being reshared. For example, if a user believes that an image of the characters represents a dangerous form of pornography or other disturbing content, it would not make sense to share it in a public discord where it is inevitably being exposed to others. It is also often even when harmless disruptive to communities.