Btw we’re both women in a relationship. My gf has been letting her 9 year old sister over more often and she doesn’t seem to understand the concept of privacy and respect yet. There’s been multiple times where I’ve tried to use the bathroom, take a shower, or even get dressed and her little sister tries to walk in the bathroom with me when she knows I’m about to need privacy and says “girls are girls”. I’ve always politely said stuff like “no I need privacy can you please get out” and have repeatedly told her I needed privacy. My gf is aware of this as she’s in the vicinity when it’s happening and she doesn’t tell her anything. But today I was on the toilet trying to poop. I hate when anyone watches me poop regardless if it’s a family member or my gf I’m not comfortable with someone being in the bathroom with me. As I was pooping my gf keeps knocking on the door to get in to look for stuff and was already frustrated because it’s the only time of day I get actual privacy to myself. As she’s looking for whatever she needs her little sister walks in and is staring at me when I have my pants down taking a shit. And I already said repeatedly that I was on the toilet. Her little sister is giggling and staring at me and my gf is also giggling thinking it’s not a big deal. After repeatedly saying I needed privacy I raised my voice and pointed out that I didn’t want her sister in the bathroom while I was using the toilet. My gf got mad at me and said I disrespected her sister and shouldn’t have said that around her . Am I the asshole for lashing out when I’ve already placed boundaries before? My gf never coaches her sister on having respect for others and it’s irritating.