Responses to effective altruism critics

Hilary Greaves's presentation, The collectivist critique of effective altruism. Like everything by Greaves, it's excellent.

This is a classic: https://forum.effectivealtruism.org/posts/hvYvH6wabAoXHJjsC/philosophical-critiques-of-effective-altruism-by-prof-jeff

CEA maintains a page of "common objections to effective altruism". It hasn't been updated for a while, but I think it provides reasonable responses to some points that I still see critics make often.

Since you mentioned an article by Will MacAskill as an example, you may be interested in another article of his, The definition of effective altruism, sect. 4 of which discusses a number of "misunderstandings of effective altruism".

Effective Altruism and its Critics, Iason Gabriel, Journal of Applied Philosophy 

https://www.researchgate.net/publication/294288831_Effective_Altruism_and_its_Critics