Hate art (not to be confused with to disliking art) is a type of artwork that is made with the intention of promoting hatred on something the artist hates, usually a piece of entertainment media. Many toxic fandoms and hatedoms are notable for drawing many of such artworks.
Why It's Rotten
They're only meant to hate on the main topic, and often have another franchise call out on the franchise that is being hated on. Their depictions can also be mean-spirited, such as showing characters from the hated franchise getting killed, abused, tortured or insulted by characters from another franchise, which is very out of character for them to do. Even some of the hate artworks they made have gore, which can disturb people who are sensitive to graphic content and imagery.
The artworks sometimes promote hate on real people, which can be offensive to such people. For example, people would make hate drawings on Jesus, Muhammad, Barack Obama, Hillary Clinton, Joe Biden, Donald Trump, etc.
They're also meant to eradicate other stances from people.
Most of the artworks are rather poorly drawn, or are simply photoshops, which shows laziness.
They ruined and killed the reputation and image of many series, and killed many communities.
They make characters who they are using to kill, abuse, torture or insult on things they hate out of character. An example is Izuku Midoriya from My Hero Academia.
Even the reception wikis aren't safe from hate artists. One example is that the Flanderization page on Loathsome Characters Wiki used to have hate art of Modern SpongeBob.