Classy Pickup Lines

This is a true story. It begs the question: why?
I was at the mall on Tuesday. I had lunch and I was searching for a particular store so I headed over to the mall directory. As I stood there, peering at the directory, this tall South Asian dude walks up to. I look up quizzically (perhaps he's about to ask me where to find a particular store??) He stares for a minute, then two, so I say: yes? This is the conversation that follows:

South Asian dude: Are you India? [shakes his head] from India? Indian?
Me [a little puzzled]: No.
South Asian dude: [looks expectant]
Me: [grudgingly] I'm from Pakistan.
South Asian dude: Oh. Well I was eating lunch, and you were sitting opposite me. I was watching you. You look good so I
came over.
Me: [backing up] Um...OK, well thanks.
South Asian dude: [moves in closer] Did you just move here?
Me: Yes.
South Asian dude: Me too. I just moved from California, and New York.
Me: Oh, OK. I hope you like Boston.
South Asian dude: I moved two days ago. Its been raining and its cold.
Me: Well, it will get much colder than this. [I like to scare people with the New England weather]
South Asian dude: Do you work here or are you student?
Me: I work
South Asian dude: I just got a job here, just across the street. I work in IT and I eat lunch at the mall.
Me: [backing up still more, I don't know whether to be afraid of this dude of feel sorry for him] Great. Well, I hope you like
Boston...[I back up into H&M]

Somehow I manage to extricate myself from this conversation. But, come on!! "I was watching you. You look good so I came over." This ranks alongside "I like your toes" as creepy pick up lines that only, ONLY, sound good in dudes' heads. And, why pray tell, do I fall victim to these? Why can't the hot dude in H&M come over with the pickup line, ever? [Purely metaphorical, there is no hot dude at H&M]
Tell me why. This is the question. It is, in a nutshell, what is wrong with my "love-life".