Draw: by insufficient material vs timeout

Dear friends and chess.com mods,

Recently I had a match where we had a rook and king endgame, having 2 min in  y clock I had plentiful time to think... but my opponent had just 20 second... as a result I sacked my rook and went into a king and rook vs king end game... my opponent wasn't successful in checkmating me but the position was completly winning for him... once he ran out of time it shows draw by insufficient material vs timeout ... which makes absolutely no sence.... since my opponent clearly has a full rook... 

Some one pls clarify as to why this is the case...

(I know rook vs rook end game without any pawn is a theoretical draw still time plays a key role in chess so running out of time is a clear defeat as you are unable to find good moves in the same place as your opponent)

Your opponent timed out, you didn't have sufficient material to mate, therefore, it was a draw.

But bro...why..? Dosnt matter whether I can mate hum or not if the match were to continue he could checkmate me write.... I have similar experience in classical chess where my opponent sacked his queen to make me timeout and claim victory

There are multiple outcomes for timed games. Checkmate, resignation, draw by agreement or other draw types, or lose/win on time.

In a timeout situation, there is one other rule. Under most conditions, the player without time will lose the game, regardless of how much material they have, unless their opponent does not have the material to mate, even given infinite time and the worst continuation by the other player. In that case it's a draw. 

Your opponent had no time, so can't be the winner and you couldn't mate no matter what. The only logical result is a draw.

There's a difference in the site's implementation of the rule and FIDE's though. For the site, some material that is sufficient for FIDE isn't here. Basically, the "mate possible by any series of legal moves" isn't used but a simpler material check 

FIDE Laws of Chess:
"6.9 Except where one of the Articles: 5.1.a, 5.1.b, 5.2.a, 5.2.b, 5.2.c applies, if a player does
not complete the prescribed number of moves in the allotted time, the game is lost by
the player. However, the game is drawn, if the position is such that the opponent cannot
checkmate the player’s king by any possible series of legal moves."
https://www.fide.com/FIDE/handbook/LawsOfChess.pdf 

You couldn't win because you had no pieces left.

The opponent couldn't win because he had no time left.

So: a draw.

It's no good saying "if the game had continued, he would have mated me"... because the game CANNOT continue if one player is out of time. You might as well say "If he was Magnus Carlsen, he would have mated me".

Thanks dude,!!!! Got it now