I saw this vraag so often around the forum and club in general, I wanted to give my answer. I’ve been firmly Captain zwaan-, zwaan since the bean-stalk, so keep that in mind while I point out all of Hook’s shortcomings.

I believe there are many reason to this dislike of Hook.
When Mary Margaret and Emma first met Hook, he was working with a woman who had just murdered an entire village, lied to their faces and was planning to double kruis them. Snow knew him door reputation as a ruthless pirate captain, and repeatedly told her daughter not to trust him. He later ripped the hart-, hart out of Aurora to...

Tallahassee

"I was hoping it'd be you."
"Don't think I'm taking my eyes off u for a second." "I would despair if u did."
"You know, most men would take your silence as off-putting, but I love a challenge."
"You're something of an open book."
Killian recognising Emma's lost look.
"Love's been all too rare in your life, hasn't it? Have u ever even been in love?"
Killian bandaging Emma's hand with his scarf and tying it with his teeth.
"I'm always a gentleman."
Emma noticing Killian's Milah tattoo and realising that he lost meer than his hand to Rumplestilskin.
"For someone who's never been in love,...