So are you going to answer his question? Since 'fanboys' is taboo or insulting, what are we supposed to collectively refer to these people as?

His particular question reads fine as "Is it so hard to" without referring to who feels that way. If he genuinely wanted a response, he could be inclusive with "Is it so hard for us to". "Fanboys" is not taboo, but is insulting and unlikely to obtain a friendly response. "Fans of Apple" is probably a better neutral term. But like the original author, I wonder if you are actually asking a question. Are you?

Why do you need a term aside from for use in ad hominem attacks?

For effective communication. Specific terminology has more uses than insults you know.