This sort of thinking is why Democrats keep repeating the same mistakes. Any sort of criticism, even if it's constructive, is treasonous. It's always someone else's fault.

Organizations either adapt or die. Rejection of criticism is a suicidal, accelerationist position. When people are so concerned with deflecting blame that they're incapable of performing an honest, frank assessment of which strategies work and which don't, then you are destined to fail no matter whether its a political party or anything else. If you'd prefer the Democrats keep doing things that don't work because you're afraid of them losing face, then your perspective is worthless.