Obama says lipstick comment not referring to Palin

Given Obama's speech making capabilities and the recent reference to lipstick being associated to Palin's joke about "the difference between a hockey mom and a pit-bull, lipstick", shouldn't Obama been aware that the connection would have been made?

Combined this with "sexist" comments made recently about Palin all over the media, shouldn't have Obama known that this would be adding fuel to the fire.