I don't agree that the adverts are offensive to white people and don't find them racially motivated at all, but I do see your point that if the roles were reversed it might cause an outcry.
In a similar way, there are several ads where they make the guy look completely incompetent or stupid by comparison to the far more intelligent female character who gets to patronise him while he scratches his head - if roles were reversed here surely there would be an outcry of sexism from womens rights campaigners, and yet nobody batters an eyelid! Just winds me up sometimes - and I'm a girlie xx