Brianna hates tiny people. Even though they're literally tiny, she thinks they take up to much space that could be used for normal-sized humans. She also hates that she has to watch her step and be careful when around tiny people. But the tiny people are normally so nice and sweet, so she feels bad about hating them, since her reasons for disliking them are because it's inconvenient for her to be around them.
But one day, while out on a walk, she sees a tiny party out in the field. There's lots of tiny humans having a good time. She can't hold it in, the sadistic side of her is coming out... she wants to stomp and torture these tinies with her feet... and she just lets it happen. She walks over to the party, kicking off her shoes and taking off her socks as she looks down on them... "These fools decided to gather in a big group, this just makes my job of extermination even easier", she thinks to herself.
The tiny people look up and don't sense a threat. They welcome her and ask her if she wants to join... little do they know... she's going to make them her foot slaves and squash them under her feet...