You raid LFR. You kill an easy boss. You get lowest quality gear.
You raid Normal. You kill a harder boss. You get better quality gear.
You raid Heroic. You kill hardest boss. You get the best quality gear.
What is particularly wrong with this?
If people prefer LFR than Normal or Heroic, that is their choice. If that impacted your raid team, well, sorry then. But making others raid so you can raid is kind of selfish, isn't? Enjoy your game, enjoy your mode of raiding and stop prevent others from raiding at a lower level than you.
It is like a professional sportsman complaining about amateurs playing the same sport because it isn't in the same league as theirs.