Just a thought:
Reading books by men: yes!
Only reading books by men: no!
Reading books by white/western people: cool!
Only reading books by white/westerners: bad!
Reading books by het and/or cis people: awesome!
Only reading books by het and/or cis people: terrible!
Reading Christian books: wonderful!
Only reading Christian books: horrible!
Reading YA/classics: spectacular!
Only reading YA or only reading classics: foolish!
Reading Mein Kampf: okay!
Only reading mein kampf: no!
Reading mein kampf uncritically; no!!!!
Not acknowledging criticism of mein kampf’s ideologies: no!!!!!!!
It’s possible for you to read any book or type of book (or any media!) and benefit. But if those are the only books you read your thoughts become narrow and, possibly, dangerous. There’s nothing wrong with European classics, but if that’s all you base your world view on your world view is terribly incomplete! And every book needs to be read critically, the ideas within it should be examined thoroughly before they’re adopted and you should listen to opponents of it, too.