Relax. Complaining about down votes is both against the rules and a waste of your time. Don't worry about it. You might feel like your initial contribution was

Relax. Complaining about down votes is both against the rules and a waste of your time. Don't worry about it. You might feel like your initial contribution was highly relevant and insightful and you might be right, but you're up against countless others who disagree, of whom a very very tiny few have decided your contribution was in fact not relevant or that it violated some other etiquette. It's OK. Rather than get riled up about how your message was received, instead consider how you might refine it for the future.