My parents don’t let me sleepover at friends house!

I’m 14 and my parents let me hang out with friends except sleepover at a friends house at my age my brother went to Las Vegas for a week with his friends and I can’t sleepover at a friends house! They say because I’m a girl and he’s a guy tbh that’s kinda sexist but like I think they should let me cuz I just wanna have fun I’ve asked if I can sleepover like 4 times and they always say no I’m almost 15 and they still don’t let me smh what do you think should they let me or am I too young?? I hate to hang out at a friends house with friends and they all have a sleep over and I have to go to my house cuz my parents don’t let me ☹️😫😤 (it’s only with girls NO GUYS)