1. Do you get vexed up at the player?
I've never been in this type of situation, but i accept that it's an occasion where it can happen and we know that anything can happen in a game, an own goal is normal and it doesn't harm a player's career.
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?
There is no way an own goal can be scored, but the team i bet on still has a chance of winning.
No, I don't go as far as to insult the player, because i understand that this can happen and mistakes are part of everyday life.
Wasting time getting angry with a team for scoring an own goal is a depressing situation. The best thing to do is to accept the loss (if the own goal contributed to your team's defeat) and try to relax. It's not worth getting angry over losing bets. You can't always come out on top.