There are people who deserve politeness. One who has such an over-inflated ego and selfishness to wait in an area blocking everybody rather than walk three feet further to wait on the side deserves absolutely no politeness or respect whatsoever.
"Oh excuse me kind sir, could you please walk three feet further and wait to the side so I can get through, thanks" Yeah right.... This guy wasn't blind he knew exactly what he was doing. He knew there was space to wait three feet away without blocking me and others, but he decided against it. Be polite to someone like that? No.
These people are scumbags living in their own little world. I can still remember my parents always telling us to walk single file if there are others and to try not to block anyone's path. A lesson which I always manage, even today.
Telling a selfish idiot to "excuse me" would do absolutely nothing because he was a grown man who should be fully aware of his actions and surroundings, however maybe my slight barge will teach him a lesson to be more courteous, and if he carries on, maybe the next person he blocks will pick him up with bare hands and throw him into traffic, that will most certainly teach him the lesson his parents didn't teach him.