Answer:
Someone who opposed annexation of the Philippines might argue that Kipling's argument in the "White Man's Burden" is a justification for imperialistic and colonialist attitudes. They might argue that Kipling's idea of the "White Man's Burden" is a way to justify the domination of other cultures and peoples by arguing that it is the duty of the "civilized" nations to uplift and civilize the "uncivilized" nations.
They might also argue that Kipling's view is ethnocentric and dismissive of the autonomy, culture, and history of the Philippines and its people. By supporting annexation, they would say, Kipling is disregarding the Philippines as a sovereign nation and its people as capable of self-rule.
They could also say that Kipling's argument of the "White Man's Burden" is a form of justification for the exploitation and oppression of the Philippines and its people for the benefit of the U.S. They may also point out that Kipling's argument is a reflection of the mindset of the time, which was characterized by the belief that Western nations were superior to others and had the right to colonize other countries.
In short, someone who opposed the annexation of the Philippines would likely see Kipling's argument in the "White Man's Burden" as a justification for imperialistic and colonialist attitudes that disregard the autonomy and dignity of other cultures and peoples.