The practical version of Effective Altruism for most people is essentially "if you're well off, you should donate a chunk of your income to buying anti-malaria bed nets/deworming medicine/direct cash transfers for the global poor". I don't see how that could "sour" in your mind, seems like a fairly unreservedly good thing.
I want to point out that there are real people [1] being helped by Effective Altruism right now. Telling them "sorry, can't help you any more, some rich asshole in the US just committed a scam, and he claimed he wanted to help you too" just seems incredibly petty and cruel to me.
[1] - This is also a group that traditionally doesn't receive much attention either.