There are certainly FCs that will take anyone who asks to join, and if all you want from a FC is "just for hang out and chill maybe talk a little bit thats all and you get free stat bonus too" then that sort of FC is for you.

Otherwise even a casual FC is going to want to know some things about you just to see if you'd be a good fit with them. If you use explicit language, then 'family friendly' FCs probably won't work for you. On the opposite side there are FCs that aren't for the easily offended. These are just examples.