Please let me start with a small rant. This tweet is, in my opinion, outright ignorant and quite distasteful:
- Assumption that modern Egyptians are the same as Ancient Egyptians. I doubt that he personally knows any Ancient Egyptians.
- "All I know are" is not representative sample of population of 80+ million nation.
- He drives original complaints to absurdity. The concept of race is rather vague, while you can discuss what skin tone did/do Egyptians have, they surely didn't look like people of Western European descent who portray them in the upcoming movie.
I find that the question of whether any given ethnic group is white or not lacks any scientific merit or any merit actually. The demarcation line between races seems to move rather freely depending on which point one tries to make. Some whites are rather dark skinned and some non-whites have fair skin.
So back to Egyptians, here is a small sample of Egyptian phenotype.

Wikipedia gives excellent summary with links to sources:
In general, various DNA studies have found that the gene frequencies
of modern North African populations are intermediate between those of
the Horn of Africa and Eurasia, though possessing a greater genetic
affinity with the populations of Eurasia than they do with Africa. The
present population of the Sahara is Caucasoid in the extreme north,
with a fairly gradual increase of Negroid component as one goes south.
http://en.wikipedia.org/wiki/DNA_history_of_Egypt#DNA_studies_on_modern_Egyptians
Definition of Race Categories Used in the US 2010 Census:
“White” refers to a person having origins in any of the original
peoples of Europe, the Middle East, or North Africa. It includes
people who indicated their race(s) as “White” or reported entries such
as Irish, German, Italian, Lebanese, Arab, Moroccan, or Caucasian.
http://www.census.gov/prod/cen2010/briefs/c2010br-02.pdf
The race and ethnicity of Ancient Egyptians has been a controversial topic for a while, again Wikipedia gives a good summary with sources.
It is now largely agreed that Dynastic Egyptians were indigenous to the Nile area. ...
In addition, peoples from the Middle East entered the Nile Valley
Stuart Tyson Smith writes in the 2001 Oxford Encyclopedia of Ancient
Egypt that "Any characterization of race of the ancient Egyptians
depends on modern cultural definitions, not on scientific study. Thus,
by modern American standards it is reasonable to characterize the
Egyptians as 'black', while acknowledging the scientific evidence for
the physical diversity of Africans.”
http://en.wikipedia.org/wiki/Ancient_Egyptian_race_controversy#Position_of_modern_scholarship
Now back to the Exodus movie. Regardless of the specific skin tone of Ancient Egyptians, actors of Western European descent bear little resemblance to the actual features of current-day people of that region.