As we all know,Many people think of Yolo as a bad thing.But when you actually think about it really is truthful.Think about it for a minute.You only live once.What the creator of the phrase " You only live once" means is , Live life while your young.Do things.Like for example If you really want to do something that may come once in a lifetime you should do it or try it.So what if you didn't make the audition,At least you tried.Live life as you want to live it.Life is what you make it, right?

So what my main question is, Why do most people dislike the term "Yolo"?

Because Yolo.
You only live once, so hate on Yolo in your only life.

lol Nice point But not really

The reason it's hated is because it is often a phrase that idiotic teenagers say when doing idiotic stuff.

You Only Live Once
well that is true
but idk why ppl hate it

Apex answered your question.
Stupid phrases for stupid people/occasions.

Then ignore those annoying teenagers

This guy explains it very well.

what if I die and i was brought back to life by paramedics?
also i hate "yolo" "swag" because it's ruining our timeline and making the future worse, (rap ruined it) rap has influenced teens to change the world of clothing and styles like "swerve" "yolo" "gucci"

Yes, please tell me more about how rap influenced teenagers worse than lady gaga and skrillex. If you asked me what the cancer of teenagers is i'd say booze and 9gag.
Don't drink and read.