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.
Hmmm, it doesn't sit well with many people and if such a player is within reach, I pray his bones are still in place.

I understand you though, that is how we should all take it because it is just football, it's not worth hurting anybody or taking it too personally under any guise. But at the same time, some players are too careless and some might do it for pecuniary gain betting sakes) and many other ignoble reasons. It's no news, many have been caught already. If it is such that it is plainly out of fault, then it will be bad if people are so bitter about the player, it's football, anything can happen. Even me, I do not like it when this happens in a crucial match and the player is so careless to have caused it. We are humans, but we still need to control our emotions.