There's no evidence of snow stealing in the demo. It sounds like you warned him before the demo and snow got upset. The most notable thing he said is 'are you blind' and 'bitch'. When you warned him not to insult(and again for stealing for some reason?) he said 'i've had just about enough of you buddy' and kept silent. Left shortly after.
Echo did steal from you, you warned and he responded. One steal isn't enough for to go off on. If it was two eh yeah but I'd have to ask the db staff.
So overall I don't deem this as enough evidence. You did the correct thing by warning the players, which I clap to but what they've done isn't enough for a punishment. Declined.