Am I overreacting or do I have the right to be pissed?

I've never once wanted my child's photos posted online. My sister went and posted photos of her naked in the bathtub on Facebook. This same sister also posted photos of her as a newborn, announcing her birth, all without my consent. I lost my cool and went off at her for doing this, while others told me I was overreacting.

Fast forward: the very people who said I was overreacting are now there, criticising people for posting their kids videos and photos on social media. When I brought it to their attention about how I went off on my sister for posting my daughter's images online without consent, they sat there and just brushed it off as nothing. Seriously, you are there criticising people for posting kid videos and images online, but you don't see how wrong it was of my sister to do this with my daughter, especially with her naked in the bath.

Am I overreacting or do I have the right to be pissed?
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