I wouldn't trust them to not accidentally inject me with the whackcine.

Edit: the Red Cross website has info different from what the guy in the screenshot said.

Q: I’ve heard claims that the Red Cross refuses to accept convalescent plasma from individuals who have received a COVID-19 vaccine because it wipes out the antibodies. Is this true?

A: There are claims circulating that incorrectly state that the Red Cross will not accept convalescent plasma donations from those who have received the COVID-19 vaccine because “the vaccine wipes out those antibodies making the convalescent plasma ineffective in treating other COVID-19 patients.” This is not accurate.

Due to the decline in hospital demand and because the Red Cross and our industry partners have been able to build a sufficient supply of convalescent plasma to meet the foreseeable needs of COVID-19 patients the Red Cross stopped collecting convalescent plasma completely on June 14.

https://www.redcross.org/about-us/news-and-events/news/2021/answers-to-common-questions-about-covid-19-vaccines-and-blood-platelet-plasma-donation-eligibility.html

I wouldn't trust them to not accidentally inject me with the whackcine.