You can answer a simple question to determine a shitcoin:
Q: Is your coin Bitcoin?
A: Yes
Result: Not a shitcoin!!
A: Yes, its Bitcoin Cash.
R: SHITCOIN!
A: Yes, its Bitcoin (ABC, XYX, Private, insert your preference here).
R: SHITCOIN!
A: No.
R: SHITCOIN!
Very funny and honestly if we really want to look at it in a way that most altcoins are actually just there for nothing and most of them are just clones of bitcoin trying to prove nothing or promising a better currency than bitcoin or just some tokens that really does not even have any real life usage or possibility of any development or product that will bring in demand for it, on a large scale, we can just simply classify most altcoins as shit coins, with just some very few exceptions that are even still questionable.
Tom Lee once said something, make sure you are holding at least 1btc, and afterwards, you can decide to buy any shit coin you want to buy. That is one crazy message.