I'm still not sure why you took such offence at someone expressing their honest opinion.
What do you take those words to mean?
I had always thought "anemic" was used to describe headphones with little bass. "Sterile" would normally simply mean they failed to produce an emotional response. What is the issue with either of those things?
You can't attack someone for saying a set of headphones didn't personally move him, or for rightly pointing out those headphones have little bass.
IME amps don't change the sound of a headphone THAT drastically to give a headphone a completely different sound signature. The only times I've heard amps that change the sound a lot they're either crappy amps or underpowered. I've heard dozens of tubes amps btw and it's usually the worse cheap tube amps that give that typical "tube sound" description. I find that the better a tube amp or vinyl rig gets, the more similar it starts to sound to great solid state/digital.