there is this restaurant that is bad(their food) but people go there anyways, how to convince people they should eat at a better place?

I am not sure why you are concerned about where others eat, if it's just because you don't like their food, I would say that you seem to have some issues, regarding how to convince people not to eat there, you can tell them you don't like it, but you need to be careful about pushing too hard because it could damage or ruin a friendship.

Step 1: Buy breeding pairs of rats
Step 2: smuggle said rats into restaurant
Step 3: release rats in strategic areas....unseen of course.

everyone enjoys different types of food

What's it to you? People make their own choices, you made yours, so let it drop.

You'll never be able to convince them not to eat at this restaurant you're talkin' about
They may have got addicted.But one day, I think they will understand that some fast food restaurants are dirty, shìtty and unhealthy but only after contracting cancer

Maybe they go there to socialize and servers are nice.

Good luck... People are set in their ways

Everyone enjoys different types of food

tripadvisor

Mind your own business and let people eat whatever they want to.

You can't. People have the right to eat where ever they want.
If you really want to do something......rent a building, close by, and serve better food at the same or lower price.

Libraryanna is completely correct. Let people eat where they want. Just because you're not fond of the restaurant doesn't mean other people shouldn't eat there. I hate Olive Garden, but my family loves it. I don't try and convince them not to go because I don't like it. Mind your own business and allow people their own choosing of where to eat.

frf

Why is it your business where people eat? Just because YOU don't like it, it doesn't mean the food is bad. It just means you think it is bad.