My Khala is a hijabi.. I love her to bits! BUT she has a habbit of preaching and not practicing and I make sure to bring it up every time. She'll stop by younger sister from finding faults in people's dress- sense and within the same minute she'll do it.
With no offense, her being hijabi doesn't make her behave like that. Even if she didn't wear hijab she would have behaved like that. But in that case most probably her double standard attitude wouldn't have been mentioned in this thread by categorizing her as a "non-hijabi" case.
In simple words, no noble act brings bad attitude in people. The bad attitude was always there, after doing hijab that bad attitude was "more" focused. There are loads of my relatives who are non-hijabi but love to preach to others what they don't practice, that doesn't mean I mention all of them as "non-hijabi" case with double standards. Because their double standards doesn't have anything to do with their being non-hijabi.
I understand that your intentions might not have been to imply that her being hijabi makes her behave like that, but the example of your khala when mentioned in this thread would definitely give this impression to people.