"Only a bookworm like you can read this boring book."
Translation:רק תולעת ספרים כמוךָ יכול לקרוא את הספר המשעמם הזה.
You see, there is some disagreement here between native speakers. How would you conjugate the verb when the subject is a certain gender (or number), but in truth refers to a person of another gender (or number)? This is not a singular case, because people can be called names that are gendered regardless of their own gender - ,אתה תופעה, היא אסון, אתם הדבר הכי טוב שקרה לחברה הזאת. My opinion is the gender of the subject "wins", so רק תולעת ספרים כמוך יכולה. But it is awkward and you see not everyone agrees.
You are right, it should be יכולה. But it is not a mistake to say יכול here if the person you are talking to is a male.
It's not correct to say it should be יכולה.
A book worm (תולעת ספרים) is a figurative to describe someone, regardless of gender, even though תולעת is female. The verb will conjugate only by the subject, not by the figurative.
In other examples the male version of the animal might be used, but I guess we're not that familiar with the male worm.