A simple sentence has one independent clause.
On the other hand, a compound sentence has two or more independent clauses.
Independent clause examples:
Billy and I went out for dinner.
We had fun at the park.
Two independent clauses examples:
I like summer, but he likes winter.
I know you're here -- I can see you.
The sentence: Everyone likes food except not everyone enjoys the same particular foods.
Yeah, you may say there are two independent clauses, but they are:
1. Not joined by
for, and, nor, but, or, yet, so
AND
2. Not joined by a comma or semicolon
So this is a simple sentence.