I feel like these interactions go through phases of 1. Being ok and acceptable and even enjoyable at first; 2. People abuse it more and more; 3. Gradually turns into a negative experience in general; 4. The ordinary person will then avoid it and that becomes the norm.

Taking your example of meeting people online. I was on the internet in the late 90s as a teenager and it was incredibly easy and fun to meet people on IRC or ICQ and just chat. Some of those people I even eventually went on to meet in person. There was no motives, no romantic interests, whatever gender people were. Fast forward to now, these things seem unthinkable to do now both for adults and adolescents, safety concerns, predators, etc.

Take real life neighborhoods for example too. Growing up in the 80s and 90s in both Asia and America, when someone rings the door bell, you open the door and see who it is and talk to them. Nowadays this is almost not the norm anymore. In the past 2 years I have been assaulted and robbed as close as a block away from my house. I'm not opening the door to any stranger ringing my door bell, even if 99% of time they are harmless solicitors. There's far too many incidents of people abusing the trust and trying to cause harm when you let them in. I am not risking that.

I don't know what the answers might be to all of this. Is society actually getting more dangerous? Is it just that we're hearing more thanks to more news and internet? Is it overall income inequality in society that causes more crimes to occur? I have no answers to any of these.