What about this?
I don’t agree that the “Buy Bitcoin” sign is a shitcoin. But it’s definitely a good example of subjective value. 
Discussion
Definitely a shitcoin. A shitcoin is something that claims to be money, but does the jobs of money worse than the best money.
A shitcoin isn't anything who's market value you disagree with.
The sign definitely wasn't an investment XD. No claim to money.
And your right, a shitcoin isn't anything who's market value you disagree with.