I don't know what is the worst coin of all alt is can you tell me what it is.
the worst of all coins are the ones who scam or abandon.
Every coin has its own potential more or less. There is nothing called worst unless and until it's a scam.
Not all of them mate, most of them are hyped or pumped coins, the worst thing we can imagine is the broken promises and abandoned projects made by the devs itself or some coins are useless at all so better to read their whitepaper to know the purposes and goals of the coins nevertheless you will experience those that I've mentioned.