Why do you care? It's just another way of saying hello. Do you hate it when someone says "hi" or "greetings" also? "What's up" (and its many variations) has the same connotations as "hello" does (well at least to anyone who hasn't been living under a rock for the last few years).
In fact, if you want to get detailed, asking someone "What's up" is actually a nicer greeting than "hello" because with the former your asking the person how/what they're doing as well as greeting him or her. "Hello" is simply a greeting.
Live and let live, dude. It's just words.
l2c
In fact, if you want to get detailed, asking someone "What's up" is actually a nicer greeting than "hello" because with the former your asking the person how/what they're doing as well as greeting him or her. "Hello" is simply a greeting.
Live and let live, dude. It's just words.
l2c
If anything, I'll initially greet someone with a "hey, how's it going?" but not something you'd learn from kindergarden english. 
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