when it is rude to offer a draw?

Jan 9, 2014, 1:01 AM |

I just played in the chess.com 5 mins tournament. In the final game, I'm ahead in pieces and time and my opponent offered a draw!!!

What he is thinking? 

This isn't my first time to be offered draw by a losing opponent.

I think it is rude to offer draw when your position is clearly lost and your time is few seconds away and your opponent got plenty of time.

What do you think guys?

What is the best way to deal with such player? blocked him?