How come my sister likes to make fun of my hobbies of filming elevators and uploading them to youtube ?

I film elevators when i have a chance to and upload them to youtube's elevator enthusiast community. My sister keeps on making fun of my hobby, calling it stupid and takes time uploading and taking up bandwidth space. I'm well known to youtube's elevator community and i have benefit out of doing this, I joined since 2008 and I have uploaded over 100 videos and i have 85 subscribers.