Why do people suck?

I’m a 54 year old man. My daughter had my first grandchild 6 months ago. While she was pregnant, my younger daughter (16), my pregnant older daughter and I went out to dinner. My youngest gets at a nearby table with friends for a bit, and while my oldest and I sat there, we noticed a table with older people staring at us. It happened to be at the table next to where my youngest was temporarily sitting. I knew what the stares were about, but didn’t want to tell my very pregnant daughter that these people thought her and I were a couple. A couple of minutes later my daughter comes and blurts out to my pregnant daughter that the people sitting next to her were so grossed out that an old guy got a young woman pregnant. I got up and walked over and told them I was her father, and their assumption was gross. The rant comes from the fact my daughter won’t go out to eat or anywhere with me unless my youngest is there, or my ex-wife (her mother). All because a couple of Karens went with the worst option rather than the simplest…that a man was out to eat with his two daughters.