It's not a complete embarrassment. Come on, it's a football game it's towards the end and your team is losing. Unless you mean the ball boy is embarrassing for not doing his job which also is unfair. I understand Hart and I understand the ball boy as he probably went looking for the ball the same place Hart went during the free kick.
The ball wasn't even out of play for that long, certainly not long enough to be swearing at kids and kicking advertising hoardings.