- People have become more and more anti social since the introduction of the smart phone.
- Intense schooling has made people apathetic to life and reluctant towards taking any initiative.
- Wealthy individuals don't need to host parties to impress their communities anymore.
- Sex soliciting apps like Tinder makes parties a place where the action isn't anymore.
- Young adults are extremely poor today. They don't have houses to throw parties in, they're too old to throw them in their parents houses, their landlord will complain if they throw a party in their apartment.
- People are afraid of being filmed when drunk and embarrassing themselves.
- Men are afraid of false sexual accusations.
- It is difficult to cater to people today if you serve food at your party or even throw a dinner. Everybody has allergies, diets and other eating problems, and they're not ashamed to demand you adapt to them.
- Wide spread narcissism. Young women and men stopped having conversations with each other at parties.
- People don't have patience to talk to each other and don't understand how to find something interesting in their fellow man.
- And yes, you're getting older.
But the number one reason I think is that the people who have been keeping up the good fight and throwing parties, barbecues, dinners and other events are sick and tired of always having to host and always invite people. So many people just float along and expect others to plan everything, contributing nothing themselves.
During the many years of schooling in childhood and being raised by parents who were also schooled, most people have had it hammered into their head that the worst crime you can do is come up with an idea or suggest something out of the routine. Of course they will not throw a party.