A lot of the Aphrodite kids get shit because they don’t do much fighting but unlike most demigods, they didn’t exactly inherit fighting abilities. They’re not naturally strong, the can’t control any forces, they don’t have the same instincts as other demigods. No amount of training can give you that. They are just frightened children who don’t even know how to defend themselves. Hardly deserving of the ‘lazy’ and ‘uncaring’ attitude they are given.
Sure, lots of them could try harder. A fair few don’t care and are too vain to realise that they need to get involved. But they get a lot of unfair bad press. Demigods at camp half-blood aren’t adults, they’re kids. They’re not soldiers, they’re children.