Some frickin’ girl dm’d me asking for help. And I don’t even know her.
She may have went to middle school with me, but I don’t even know her nor I don’t want to talk to her.
I try to dm people I know on Instagram.
I have blocked her, and told her to never dm me again.
The same encounter happened before.
Lots of people pretend to be others, or old friends. One or two people a month message me, having hacked or cloned accounts of one of my friends. I have no problem figuring out who’s a fake, so I report and block them. I also let the real friend know their account’s been compromised.
It is completely fine to block someone you don’t know. As @Wings said, when it comes to online interactions, you never know. On Instagram especially, a lot of trandom DMs are from bots, so it’s always worth it to filter what you receive.