To objectify means to treat as an object. In sexual terms, it refers to one person seeking their own sexual gratification with no regard for the feelings, interests, needs, etc. of the other party.
Some feminists frame men as always objectifying women, and always seeking to take sexual advantage of women. From this comes the idea that BoyLovers (usually male) therefore must be objectifying the boys they are attracted to.
As a rule, BoyLovers rarely "objectify" the boys with whom they wish to enter into a relationship with. To the BoyLover, the boy is a real human being, and not an object, but a person who has real feelings, and the BoyLover usually highly respects the boy's feelings.