Snape's Hatred for Harry

[jennyferlynne0276]

No: HPFGUIDX 99980

While listening to TOoP for the fifth time, it struck me: Why, when 
Harry first came to Hogwarts, did Snape assume that he would be just 
like his father, when Harry wasn't even raised in awareness of his 
parents or the wizarding world? Why does Snape assume that Harry 
would find what his dad did in the memory (TOoP, "Snape's Worst 
Memory")funny or amusing, or that Harry purposfully emulates someone 
who he doesn't remember and had absolutely no influence over Harry's 
upbringing? 

Jennyfer