Someone who likes things specifically because they are bad or poorly made can be called a "a bad taste enthusiast". This would be a person who has an interest or enjoyment in things that are considered to be in poor taste or offensive by most people.
There are other terms that could be used to describe such a person too depending on context and tone:
These terms are not necessarily always expressed with disapproval, as some people might have a genuine interest in things that are considered to be in bad taste. Also, the word "enthusiast" may not be suitable for all contexts, for example in a formal or professional setting, in that case, it's better to use a more neutral term such as "person interested in" or "person with a taste for".
Be mindful that some of these terms might have a negative implication, so you should use them carefully, strategically, and in the appropriate context.