You're the only one using the word "only"

Curious how an equals sign got drawn in your thinking between "likes action heroes" and "less capable."

It was "ONLY like action heroes". And yes, if you by default assume they like ONLY that, you are assuming they are dumber then girls. Because girls get more nuanced and smarter literature mixed with junk.

What you will also achieve is alienation of boys who are indeed smarter and get bored with reading same hero action book again.

I remain firm in replying to precisely that sentiment. I don't believe many will admit it, but this is how many view boys: stupider and less-capable girls.