Spain is a nationality, not a race. It can be (and is) full of a panoply of races and cultures. I personally wouldn't characterize Spaniards as a race because that would reflect poorly on myself.
I can't find evidence of overt racism in any of mou's messaging. I have seen him discuss rather crudely (in an English as a second language manner) of nationalities aligning with riders, which I think we can all agree to as being natural (meaning followers of riders mostly coming from nations of the rider), and demonstrably proven.
On twitter, he can also further characterize their thoughts as low in IQ and other language that wouldn't fly on this platform, as an example. Be that as it may, he is on twitter, which is mostly anything goes until the software collects so many complaints. I am sure he could clear that up with the platform is he was a paid verified member.