Why can't Obama's critics admit that they attack him because of his race?

There's the race card again. You can't ever say anything mean about Barack because he's half black. The issue I have with him is not his race. It's his incompetence and how he pisses on the Constitution day in and day out while breaking all his campaign promises. Everyone is EXTRA hard on him because he told us he would be the best thing to ever happen to America and he's making everything worse.