No. It's nothing like that. Calling a scotsman an englishman is like calling a xhosa a zulu. But you could call him a pom (or, pohm). Not saying that he'll love you for it but you're more likely to get you head kicked in for calling him english than a pom.
And I hope you're not giving any energy to being called a boer. The EFF are trying to push for the very response that they got.
I am not a boer. It is neither culturally or technically appropriate to call me such. The term boer is used to describe Afrikaans people or farmers. I am neither. If some people take pride in being called a boer... like many afrikaans people do... thats great for them. They can run with it. Its not me or my culture.