I think its the fact that a lot of low quality content have a ridiculous number of upvotes. Most of that is not possible is not possible without bots. Also the amount of people posting replies then asking for upvotes on their posts is annoying enough. A lot of stuff on this platform does not feel authentic, its like everyone is out to only maximise the number of upvotes they can get rather than the quality of what they are posting. You can compare this with facebook, linkedin, medium and there is a very big difference in quality