Online cuestion... Why?

Hi… Why some players have “special” powers? Like… Super lounge in all melees, eat nades with half shields without die, never die in 4shots etc… All that stuff we know.
Im not talking about bad internet or high ping… I have good internet 40-50ping almost every gameand still found " “eaters” even sometimes im the own eater…
Why that happen in online shooters?