Grey or Gray...does it matter?
This is just a difference between American and British English. Yelling at people for using one form or another or shouting imperialism when one committee chooses a spelling you disagree with is no different to me than birding in Japan, Germany, or any other country, and getting mad that they refuse to use english language names for birds.
At least the loon vs divers, Jaegar vs Skua debate I can understand, since those are completely different words, and I no birders that do get confused over that. There is absolutely 0 confusion if I use a different spelling of gray/grey in written communication (and none in spoken language!)
I prefer that sentence to read...This is just a difference between English and American English.