That does sound terrible, there are all sorts of types on the internet unfortunately. While that is very terrible what happened to you I'm going to assume the website you need not mention catered to over 18 members maybe?When I was thirteen, some 34-year-old creep-asshat-douche tried to get me to RP as myself with himself in a 'daddy-daughter kink reliever' thing. Not just like, DDLG or whatever, but he wanted me to call him Father or Dad.
Take a guess what website I was cruising because the creepy eighteen-year-old who peeked into my windows suggested it. Go ahead. Guess. Guess.