When opening up sets i find that sometimes i will immediately be blown out of the water by some phrases:

Examples of this are:

"Who are you?"
"I was just in a really important conversation"
"Why are you talking to us?"
"Do i know you?"

When she (mother hen) says one of these phrases i usually stammer and stop because I can't think of any good responses (screwing me up royally).

Could you guys give me some responses to these sort of lines? Or maybe a technique to stop them giving me this line in the first place?

I would love to hear from you guys.

Thanks, Elixir