Art is subjective. It comes in a 1000 different forms and not everyone "gets" the nominations or the winner. (In fact, most people don't).
Art is meant to create a reaction, good or bad. The fact you have critiqued the car with the doily on it is a positive one. You're engaged with the image.
The artist has placed some meaning on the piece and whilst 99% of us don't understand what that might be, the "fun" is trying to figure it out. Often we are way off but it's fine.
You don't have to like it. You can say it's crap ir pointless. It's ok to say so. Most Turner entrants are quite vapid and annoying because it's self-indulgent but that's just me. Again, because I called it self-indulgent I've made a reaction so the piece gas achieved something.
Personally I don't understand it nor like it but that's my opinion. I'm into more tangible forms of arts like painting, photography, architecture and sculpture. I'm not a content creator myself but I like looking at art and deciding what I find appealing.