The best way to refute a sacrifice is usually to accept it. The best way to annoy the sacrificer (is that a word?) is usually to decline it. Anyway, you can "counter" it by improving your tactics. That will let you see when he is setting up a sacrifice and to defend from his threats after he does.
Guy sacrifice all the time!

Im playing online chess vs a guy i know. He sacrifice all the damn time. Evreytime I'm starting to make some traps or try to get my minor piecesin the midle he just sacrifice. How should I counter this crap?
take his sacrifices and defend.

Defend and win the endgame?
Ofcourse a sacrifice is good if you can't defend. Try a closed quiet game against this person instead. When you are aware of your opponents playingstyle you can adjust your playing style accordingly which is all part of the game.
Thanks for fast replay. Ofc i retake the sacrifice. But it's so annoying, because at the end it's just some pwns and a rook.
And it's hard for me to just defend. I feel I have a very aggressiv playing style and I win more often than i lose. This sacrifice playing style is so annoying.

You know this guy? So just tell him to stop sacrificing and play a decent game like 99% of the people on the site.
Can you give an example?
If my rook is defended by a pwn and hes rook is defended. He just sacrifice the rook for a rook, and im not geting a double pwn.

You could keep in mind he likes to sac a lot and anticipate his counterplay by denying him opportunities to set up a sacrifice.
Kind of like preventing tactical opportunities with prophylaxis.
Does that make sense?
You could keep in mind he likes to sac a lot and anticipate his counterplay by denying him opportunities to set up a sacrifice.
Kind of like preventing tactical opportunities with prophylaxis.
Does that make sense?
Yeah, it does. Thanks for the replay. I guess I should try to avoid it and set a trap for him.

Can you give an example?
If my rook is defended by a pwn and hes rook is defended. He just sacrifice the rook for a rook, and im not geting a double pwn.
I am hearing that he likes to exchange pieces?
Can you give an example?
If my rook is defended by a pwn and hes rook is defended. He just sacrifice the rook for a rook, and im not geting a double pwn.
I am hearing that he likes to exchange pieces?
That is correct

Sacrificing pieces and exchange them are two totally different things. Look up the definitions of "exchange" and "sacrifice" and then comes back and tell us which one your friend likes to do.
Can you give an example?
If my rook is defended by a pwn and hes rook is defended. He just sacrifice the rook for a rook, and im not geting a double pwn.
Now I get what you mean - you mean exchanging, not sacrificing I think. Sacrificing is when you give up a piece for a less valuable piece, like a knight for a pawn or a queen for a rook. Rook for rook is just an exchange. He´ll do it to mess up your pawn structure for the endgame, that´s what he´s aiming at. Best strategy is always to look and see how your pieces are defended, so that if exchanges can´t be avoided you´ll still have a good setup for the endgame. Another popular exchange is of queens very early on, if it deprives the opponent of the right to castle and leaves him out in the open at the mercy of rooks and bishops. Example - the Scotch opening:
Im playing online chess vs a guy i know. He exchange all the damn time. Evreytime I'm starting to make some traps or try to get my minor piecesin the midle he just go for the trade. How should I counter this crap?