Bit of a nasty thing to say.
As you said: what do you know?
Telling the OP the boots look like big, clunky, surgical boots people wore who had one leg shorter than the other! isn't going to help her "enjoy!" them.
Maybe you'd be surprised to know that some people still have differing leg lengths and still need shoes/boots that help their problems. My cousin is one.
No, she wouldn't wish anyone to have a similar problem but she would be crushed to know that people like you look and judge her boots.
Were your exclamation marks meant to make those sentences seem funny?