Bad form?

[JustBeginning]

My brother was playing a hand on Pokerstars when the following happened. Is it acceptable behaviour to ask an opponeent not to call? What can be done about it?


PokerStars Game #5883115097: Tournament #29787350, $3.00+$0.40 Hold'em No Limit - Level VII (100/200) - 2006/08/11 - 21:51:56 (ET)
Table '29787350 1' 10-max Seat #6 is the button
Seat 6: ryguyism (4455 in chips)
Seat 8: Giller_Wpg (6615 in chips)
Seat 9: HERO (1550 in chips)
Seat 10: golfnut2005 (2380 in chips)
ryguyism: posts the ante 25
Giller_Wpg: posts the ante 25
HERO: posts the ante 25
golfnut2005: posts the ante 25
Giller_Wpg: posts small blind 100
HERO: posts big blind 200
*** HOLE CARDS ***
Dealt to HERO [Kh Qd]
ryguyism said, "giller"
golfnut2005: folds
Giller_Wpg said, "?"
ryguyism: calls 200
Giller_Wpg: calls 100
twotwoallin: raises 600 to 800
ryguyism said, "dont call"
Giller_Wpg said, "ok"
ryguyism: raises 3630 to 4430 and is all-in
Giller_Wpg: folds
HERO: calls 725 and is all-in
*** FLOP *** [8h 9c 7d]
*** TURN *** [8h 9c 7d] [Ad]
*** RIVER *** [8h 9c 7d Ad] [3c]
*** SHOW DOWN ***
twotwoallin: shows [Kh Qd] (high card Ace)
ryguyism: shows [9d 9s] (three of a kind, Nines)
ryguyism collected 3350 from pot
Giller_Wpg said, "lol nh"
golfnut2005 said, "nh"
*** SUMMARY ***
Total pot 3350 | Rake 0
Board [8h 9c 7d Ad 3c]
Seat 6: ryguyism (button) showed [9d 9s] and won (3350) with three of a kind, Nines
Seat 8: Giller_Wpg (small blind) folded before Flop
Seat 9: HERO (big blind) showed [Kh Qd] and lost with high card Ace
Seat 10: golfnut2005 folded before Flop (didn't bet)