Why are people so weird, and insensitive?

I've recently been noticing so much hate, negativity, and hypersexuality online, and even in person. I see so many videos of little kids, people with mental health issues, or sick people and the comments are always filled with hate, or sexual things. Even when the video is positive, the comments are negative. It's becoming so normalized on the internet that people are acting like that in real life. Maybe i'm just being dramatic though.