I think a lot of the whitewashing wank happened because people were upset that Marvel cast another bland white guy for Doctor Strange instead of the more popular POC fancasts.

Also, at this point, a lot of people were still angry that Elizabeth Olsen was cast as Wanda in AoU because they thought Marvel was trying to erase Wanda's Roma-Jewish heritage (not that two Jewish characters supporting and working for Nazis went over any better - and erasing any reference to their religion caused wank as well).