If it is not clear: "nobody cares about yet another.." here means "nobody (among people that stereotype might be applied to) cares (finds it offensive) about yet another..". That is the meaning is the opposite to your interpretation. I agree the initial comment might have sounded ambiguously.
Your comment could be less patronizing.
Look, I know it sucked in school, being ostracized for having technical interests, but now you're grown-up and loaded. As part of a larger social agenda, I can see some harm in perpetuating these geek stereotypes, but on a personal level, you are not being exploited, so quit whining.