I wouldn't judge anyone for donating more or less per se. It's just weird to hear people describe themselves as "effective altruists" if their current level is "actually, as a student I don't have any income, so I never really donated anything, but a few years later I am totally going to donate". It makes you wonder how large is exactly the set of effective altruists who have already donated at least one cent. Also, it cheapens the meaning of the words.

Perhaps mathematically speaking, the difference between donating 0 and donating 1 is much smaller than between donating 1 and donating 1000. But psychologically it is probably the other way round. The person who has already donated $1 to a GiveWell charity has already overcome the trivial inconveniences; all that is necessary is to repeat the same steps again with a different number. But the difference between 0 and 1 is the difference between "all talk, no action" and making the first step.

Hardcore EAs -- awesome; softcore EAs -- still very good; zerocore EAs -- please stop using the label.

I wonder what is the real distribution among people who publicly identify as EAs.

Maybe there could be some verification system, like a website that would publicly certify that you have donated at least $1 to an effective charity. (Or maybe multiple tiers, but this is already more or less what James_Miller suggested. Just saying that the minimal amount could be small, but definitely nonzero.)