Esports has been a big deal in South Korea for many years dating back to at least Starcraft: Brood War if memory serves. Meanwhile here in the West there's still a stigma attached to it, mostly from a lack of understanding of all that goes into it which in turn leads to prejudice. Yes it's playing a video game but just like in traditional sports the top players have to pour hours and hours into the game trying to improve their skills, mechanics and in the case of team play teamwork and synergy. Most of the major gaming orgs have analysts, coaches (including life coaches in some cases) and sometimes even professional chefs and trainers to help keep their players physically, mentally and emotionally healthy and fit, meaning it's not just solely staring in front of the screen. Making sure the players are in the best shape they can be allows them to do the best they can when they compete, which in turn helps justify their paychecks.
Take RIck Fox, a former top NBA player (and later an actor). He formed the esports org Echo Fox and has done much to help support esports and try to help remove the negative stigma attached to digital athletes and sports.
If you don't like esports that's fine. I personally don't like traditional sports anymore and find them boring compared to esports. That said I would suggest doing some more research regarding esports in general rather than blindly insult it based on the LoL scene alone as every game is different.