I don't except kids to throw tantrums or make incredible messes, I do expect that kids will be on average a little louder then adults and a little messier. (I mean at coffee shop dinner type place. Adults at a sport bar during play off or kids the Chucky cheese will be messier and louder then the average ticker tape parade of machining bands
) This isn't a cocktail party or a 4 star restaurant. This is a coffee shop that; Sells ice cream cones with sprinkels 4 kids now I know because it was on the FB, where the owner dresses in costume for holidays , that decorates for holiday with more spinny, shinny hearts/shamrocks then any Jr High dance I've ever seen, whose FB page shows "customers"* that are teens (I'm pretty sure I saw a baby too and only one adult without children ) , Whose business cards is a rainbow color cartoon , in which nearly every FB pot starts with "Hey kids..... " , whose mascot? is a child. Nothing about this shop says "adults doing business SHHHHH!" Again I'm not trying to imply in any way shape or form that this means its ok for kids to have tantrums in there but I would expect it to be a bit louder and jovial then some of the museum like coffee shops Ive been too or even a Tim Hortons type place.
I don't think she was rude to kick them out. I think she was rude to be snarky and funny toward a Customer as a business entity in public.