It means something that is very difficult or unpleasant to deal with, and that people want to avoid being associated with.
Here's why the idiom is used:
* Hot potatoes are unpleasant to hold: A hot potato is literally unpleasant to hold for too long, due to its temperature.
* People pass hot potatoes quickly: If someone is handed a hot potato, they tend to want to get rid of it as quickly as possible.
Therefore, the idiom "you like a hot potato" implies that something is so troublesome or undesirable that people want to avoid it or pass it on to someone else.
Example:
* "The politician's controversial stance on immigration made him a hot potato in the media."
Let me know if you had a different idiom in mind, and I'd be happy to explain it!