Shawn doesn't tell anyone why he loves pineapple.
If anyone asks him about his affinity for the yellow fruit he shies away from the question. Instead he asks the questioner if they, themselves, are a "fan of delicious flavor". As soon as the last word leaves Shawn's mouth he or she are none the wiser that he'd changed subjects covertly, and Shawn never lied to them once.
The truth is the first time he tried pineapple was the last day before he ever heard his parents fight. Now every time he takes a bite of pineapple he gets a taste of what it used to be like before...