Dalton showcased how he's an honorable man.
Cornelia as well as most Britanians weren't happy about Suzaku being knighted...
but Dalton, who acknowledges the person's ability regardless of his/her race, and Lloyd, being scientist who couldn't give a rat's ass about one's race, started the clap for everyone.
Dalton reminds me of Toudou. They both share a similar bushido value.
Btw, when Zero was making speech about the reorganization of OoBK, there were people unhappy about Diethart being appointed to such an important position, for both being Britanian and being part of the mass media. Zero silenced them telling them how he himself isn't a Japanese either, and he doesn't care for their past, origin, or race.