I think lipsipsuckit is definitely onto the right idea. The whole point is preference.
After reading the forum post "The Evolution of Gay Sex" ... it sounds like gay sex has improved just like the way our rights have improved. "Bottom shaming" is still around and from the sounds of his forum post was very prevalent back then.
I'm glad that the gay people I know are not ashamed of their preferences. Announcing what you like done to your body or being up front about what you like sexually should be applauded... so long as it doesn't hurt anyone and is also consented to.
I find the distaste for these labels very interesting. Especially when it comes from another gay man. Honestly, it only makes me more curious as to their own sexual practices...though I am aware thats entirely their business. LOL