Can you not just set your profiles to private and no befriend them? You could always say "I don't really go on there" if they ask why you've ignored a request from them 😂
I only ever had an issue with this when girls would call out of work because they were sick when they were partying all night before & then were active on social media all day and going to the mall, restaurants, out with friends etc. when they were “sick.” To me if you’re going to be irresponsible, you shouldn’t be working there in the first place lol or Atleast don’t be silly and blast it all over for everyone to see
You don't have to block them, You could just limit what they can actually see that way they probley wouldn't notice x