Just out of curiosity I looked at some of your older posts on your other accounts (turning on showdead). Being relatively new here myself (about 7 months) I can't speak for the staff or the downvoters, but if you were to look at your posting history over the past 21 days you might be able to infer the behaviors that get them upset. You might even try a statistical analysis of your killed posts if you really want to understand what is triggering the automatic kill switch.
The point I want to make is that when participating in a community, there is usually a natural feedback process that allows one to discover the rules and values of that community. If one does something out of line, the community will swiftly react. Multiple negative reactions are a sign that one's behavior isn't in line with the community's standards, and should be used as an input to the decision-making loop that says, "Wait, maybe they don't like it when I do X all the time." Then, you either decide to adapt to the community, or you leave.
Also, most communities will only accept a limited amount of correction from any given source, which varies by source and by community. One of the behaviors that's likely to earn repeated negative feedback is trying to change the community more than allowed by one's standing within the community.