I don't think Dogecoin supporters have anything to do with negative posts about Bitcoin. I am more thinking it is the Bitcoin supporters themselves especially those people who have a weak hand. The fact that Bitcoin undergoes a deep correction leading for them to spread FUD and FOMO across the market, thinking that the bull run was over. Little did they know that it was just a normal occurrence, after reaching an ATH expect that there will be a correction. Anyway, let those who have weak hands panic because there's a lot of people who are ready to catch what they have sold.
Dogecoin itself was created by those who hated Bitcoin, in order to mock the entire idea of cryptocurrency. That's why I find it so ironic that so many of the "cryptocurrency" users have a positive view about Dogecoin. Either they are unaware of its history, or they are simply blinded by greed. IMO, Doegecoin is like the sword of Damocles that hang over the head of every cryptocurrency user. No one knows when it will act as a trojan to destroy the entire cryptocurrency sector.