It made me start thinking - isn't Bitcoin Cash guilty of trademark abuse here?
There is no trademark to abuse.
By virtue of having a product or service that is well-known, you have legally protected rights to that trademark.
That is not true. But even if it were true, what is the trademark you claim is being abused, and who owns it?
I suggest you read up on some basic trademark law, common law trademark in particular, if you think there is no trademark. That said, your point that there is no owner, hence nobody to enforce it is very valid, I suspect this is the reason it cannot be considered trademark abuse.
As for the other person claiming that Bitcoin Cash is the real Bitcoin, does it grind your gears to hear that I sold all my Bitcoin Cash to buy Bitcoin?