Fixed: I just beat someone who has been playing for a long time

maybe he is trying out some champ he never played before, dont get too cocky
also, you probably played a normal game which ppl usually dont give a dam about it, ppl like to surrender at 20 in normal if they are losing
play ranked, cuz ppl never surrender!!

Maybe he has 4000 losses

this just in number of wins directly correlates to how good you are

this makes no sense

number of games played has nothing to do with skill O.o

he's probably lost twice as many as that too

so?

Number of wins really only tells you how many games they have played, not their overall level of skill.

While a lot of wins will mean having more experience, this does not guarantee that they are better than a player with less wins.