Or maybe it is the other way around?
People who don't play sub and didn't even tried it because they think it mega hard to play it (when it's not) and thus feel "diminished" about that.
I don't wan't to generalize but i have seen 2 interesting things on this forum lately:
1) ppl playing sub encouraging others to try and advising not to give any thoughts on the illusion of difficulty this spec have
2) the threads were such arrogance is shown by sub players are in fact began by judgements from assa or combat players.
So yes rogues that have experience on fights will tell you that sub is better on most fight for progression if you want to give all you have for your raid (and doing this or not depends on the objectives of your guild, there is no right or wrong answer). That doesn't mean you have to di it, but if ppl ask advices and then call the ppl arrogants because they answer truthfully but didn't like the answer, that's not a pb from sub players. I don't say that everything is black or white but everybody has to watch how he acts on these threads, not sub players only, because other players are not necessarily saints.
And to add a little something, sub is a spec great for progression but not because of it's generally dps. We could be with assa doing a little bit more ST damage than sub, sub would still be better than assa on some fights because of the tools it provides.