Low flop but opponent over bets it what to do

[Poker_God]

I see alot of ridiculous bets on-line. Hands where there is like 100 bucks in the pot and someone bets like 500 into it on a rag flop. Does this mean that they hold pockets or dont want anyone to call the bet? I had a hand i bet 200 with AK blinds are 50-100 and someone just calls on the button...flop comes out 8 2 4 all diff. suits..i check and he goes all-in for another 100 ...i folded but did i fold the best hand...any comment is welcome.