I use this phrase all of the time & I know that it can be used/meant in a hateful way towards certain groups of people, but I guarantee you that I have never used this phrase in a derogatory way.
I use it with my family members, especially Scott & Luke....I use it with groups of students...I use it when talking with friends...I use it when talking in/with groups...I just plain use it all of the time...
I hear myself say it sometimes & think "hmmm...that could've come across a bit harsh sounding if my tone would've been different" but I have noticed that I'm not usually using it in a harsh way-so hopefully it never has.
I swear that if I ever "you people just need to..." you, please don't take offense to it because I don't when my grandma & her son (my dad) "you people" ME! :)
Now, all of "you people" just keep on checking back here from time to time ;)