Na, that’s cool. He’s an exec at the donation agency, it’s a point of common interest. If it was just some random dude and you start prattling on about how much blood you’ve donated, that would be off.
When I want to brag about something but I don’t want to sound like I am bragging, I say 'I am stupid-proud of myself. I never thought I could do that." It makes it clear that I am showing my happiness in my own achievement, not trying to one-up anyone else.
Matthew 6:1-4: “Beware of practicing your righteousness before men to be noticed by them; otherwise you have no reward with your Father who is in heaven. So when you give to the poor, do not sound a trumpet before you, as the hypocrites do in the synagogues and in the streets, so that they may be honored by men.”
Might be relevant if he was boasting to random people, but to one of the executives of the donation agency? Not at all. That’s the kind of stuff I’d love to hear from donors if I’m one of the people in charge of the organization.