1. Do you get vexed up at the player?
2. Do you take it as a common loss by the team just like other days? or
3. Do you curse the player for that?
We need to understand that nobody is above mistakes, inasmuch as the own goal is not intentional, we have to take it as one of those unfortunate incidents in football. I'll naturally be angry at the player that mistakenly scored in his own net, I'm losing my bet because of his blunder, but then I'll move on from the lose after the match. Where I won't forgive the player is if it's proven that the own goal is as a result of match fixing, then as many as are involved in it I won't be happy with them. That is why I always advocate to always gamble with the amount that you can afford to loose because anything can happen in a match, it can favor your bet or it won't.
Maybe we will piss off with player that mistakenly scored in his own net but we know that is coincedencetally happen and not because he want to do that. But most people will blame him doing that mistake and judge him because of his fault which can affect to all players on that team. But if that goal is because of the match fixing, people will be more angry to that player and those who arrange the match fixing and want to kick them all.
And yes, I agree with you to gamble with the money we can afford to lose because that can prevent the big lose especially if that thing happen in the match. We know that everything can happen in the match so we need to anticipate that we don't have to get a big lose.