It's a merc. For some reason 90% of owners think the world owes them something and they are better than everyone else.
When you see the badge, chances are the driver is the biggest prick you will meet today. Treat it as a warning and your day will be better.
As a blue badge holder I can park whereever I chose. I am entitled to park over two spaces if I need the room to get out my vehicle. Now buzz off you sad pathetic little man!