why does almost every low elo player claim someone is boosted

every time the feeding player will say "you must have been boosted" or something if you give them an accurate reason as to what you are doing. For example im pushing bot like im suppose to while the feeding mid and top pick a fight mid. Then without me talking all game says "this boosted adc thinks hes a splitpusher" in all chat as he dies. I find it pretty funny that worse players even in normals will just shit talk higher rated players even if its not that high and they are wrong "was on d5 account which is trash elo" But what i reallly dont understand is why players that are obviously bad and doing bad things in game just flame instead of trying to get better. There is no way unless you have a mental disease like dunning kruger cant actually believe you are good at the game for being bronze-diamond2ish because those players just arent. Also the people that get mad and butthurt that i call it low elo because it is. Its like the older people who are smarter saying santa doesnt exist some still "believe" but they know its not real only blind kids believe so dont cry you ARE low elo but guess what? who cares? you arent gonna be a pro anyways sorry, you also wont be president either but is someone an asshole for saying the truth? No you are only an asshole if you get butthurt or mad about the truth teller. Dont hate the player hate the game