Yeah goalies get too much flak for every little screwup irrespective of how well they have been performing the rest of the game/s. The risk of screwing up goes exponentially up as you move away from the front line:

• If a striker fucks up, it's just a missed opportunity and while you may hold your head in your hands, you won't exactly curse him for it unless it's something like what that Nigerian striker did in the other match.
• If a mid-fielder screws up, he gets some flak since it usually results in an attack but there is still a line of defense which saves him from major embarrassments most of the time.
• If a defender makes a mistake up then he gets a lot of heat and is under pressure for the rest of the match since at that position, a wrong pass/clearance immediately puts the goal at risk.
• Now if the keeper screws up then he is blasted to hell because he is the last line of defense and in most cases, any major mistake from the keeper ends up in a goal or at least makes him look like a total tool. The margin of error is negligible and the results of the mistakes are not pretty, which makes it even harder for him.