If she had stopped at "Your invite to connect is inappropriate, beneficial only to you, and tacky" we wouldn't have even known about it. While that would have been a brusque response, it was still correct.
I hate cold calls, because every single one (for me) involves somebody trying to get something out of me without anything substantive in return. My experience may be atypical, and I acknowledge that not every cold call is like that.
But this one reeks of "let me try to leech onto your network". The 20-something got backhanded, and has run crying to the social mob so that that mean, mean lady will get punished.
Both parties could have handled this better. Unfortunately, the instigator of this whole affair has simply been rewarded for her clumsy and clueless actions by a) getting attention and b) ensuring that the person who hurt her feelings has been tarred and feathered.