Grammatical correctness and meaning are two separate functions, and they don’t always coexist.
Noam Chomsky devised a sentence with perfect grammar and no meaning: Colorless green ideas sleep furiously.
It is also possible to devise a sentence which a listener or reader can understand though it is grammatically incorrect.
Another reason why he dislikes lots of motorcycles in one area are large motorcycle rallies where a lot of people get their bikes there on pickup trucks, and just rides them around the town for show.
Can you construct a sentence which is grammatically correct, but meaningless? A sentence which has meaning, but is grammatically incorrect?
The second task is usually the greater challenge.
***
Sometimes the reader or listener is asked to fill in meaning in order to make a sentence grammatical. Conversations go on all the time where one person or the other has to make assumptions in order to communicate.
If your companion says Coffee? she means [Do you want] coffee? It is up to you to fill in the missing pieces.
As if can be a full answer, though not a full sentence.
This guy says I’ll fall in love with him.
As if.
Means
[This guy was acting] as if [I might fall in love with him].
Come here!
Means
[I am asking you to] or [You must] come here.
You can come early.
Wonderful!
means
You can come early [if you want to come early].
[That is a] wonderful [suggestion].
***
The takeaway is that communication requires more than merely grammar, but without a mutual agreement about grammar, clear communication is not possible. This mutual agreement is second nature and we hardly notice it.