What's an intelligent answer to give my stepmom when she puts me down in front of guests?

First of all, hi fluther, newbie here posting my first question :)

Basically my stepmother and I have a really lousy relationship and I did everything I could to prevent the wedding and since then she’s doing everything she can to make my life miserable and get revenge. And a few days ago she started this big scandal…can’t help but think of Shawn Elliot’s song, “Shame and Scandal in the family :)…because the snow had melted and it was pretty slushy outside and I was in a hurry to get something from my room and didn’t take my shoes off at the door and left a bit of slush and water on the hardwood floor.

So after about 20 mins of yelling she announced that as a punishment my sister and I are no longer allowed to wear shoes in the house, not even indoors shoes that we never use outside which makes no sense to me. So I said fine, I’ll just wear socks then but she said we couldn’t do that either because we have tile and hardwood floors and apparently we could slip and break our neck if we walk on it in socks.I tried reminding her that we’re not 5 but 16 (me) and 14 (my sister) so I’m sure our sense of balance must have developed by now but she had none of it so for the last 4 days she’s been forcing us to walk around barefoot in the middle of the winter. Now this is not such a big deal to me as most of the time I would do the same on my own free will and I even realised I actually don’t own any socks because I mostly wear flats outside and the sports i do are artistic gymnastics and swimming neither of which require socks but somehow now that I know i have to stay like this not because I want to but because she’s making me do it I find it pretty frustrating and I’m aware of it all the time.

And what’s really bothering me, we had two families visiting us this weekend and she never failed to mention this to them (with me in the room) explaining what I did and how I’m now being punished and have to be barefoot inside and it created some pretty awkward moments and I definitely felt embarrassed by it while my dad just stood there like an idiot and said nothing to defend me. Then today I had some friends over earlier and again she made sure she told them the whole story again.

Two questions:
1. I would really like to come up with an intelligent remark next time she starts again embarrassing me in front of guests. Any idea what I could say to kind of embarrass her back but without being too direct cause that would piss my dad off and he’s head over heels into her…

2. Could this be considered in any way abusive? Like if I would call CPS would she get in trouble for it? This is more of a hypotethical question and I don’t think I would actually do it since it would hurt my dad and I don’t want that, but just for argument’s sake do you think I would have a case?

Many thanks,
Kara.