I like to use a neg in a group setting if you are ignoring your target and she buds in, you could say something off the cuff to the group like 'is she always like this or is she always this needy?' but you dont dwell on it. Nor should you always use negs, they are not essential. It's just another trick to have up your sleeve.
"You only live once, and the way I live, once is enough."