Oh, he is to blame for a great many things. But, he was quite clearly called a racist up until recently. Somehow Bush went from being the Devil on the Right, to an okay guy just calling out how bad Trump is.
As for 9/11 no disagreement.
As for flood plain, some small amount of disagreement. Insurance companies should be able to charge more when people live in higher risk areas. That will mean some poor people cant afford there, but that is just life.
It's simply that Trump makes almost all previous Presidents look good in comparison. Also there are different levels of racism. I used to think Trump was just an unthinking racist-by-default, who had no explicit ideological racist beliefs, but was the type to go along with others racism because it would take conscious effort and involve a political cost to oppose it.
But now I think he is a much more conscious racist (what with all his musings about 'German blood' and 'racehorse breeding', and his reluctance to condemn swastika waving). Dubya never seemed to be that.