OP, I love your thread title. You stay classy, San Diego.

Long story short:

Expect awfulness in DF. Period. It's not even worth discussing how people behave in there, because you'll get people who not only don't know the fight, but are INCAPABLE of learning, such as healers who simply do not understand that maybe standing on top of the dps and pushing everyone into Ifrit with Searing Wind is maybe a bad idea. Not only will they continue to do this infinitely, they will yell at YOU for dying to the Eruptions that THEY sent you careening into. BECAUSE OBVIOUSLY. (This, btw, is way more problematic than people saying "yo go watch a video".)

Similarly, expect jerks in DF. Get over it. If you don't want the lolz, don't join DF. That goes for pros and noobs alike. That's just life.

I think the REAL problem is when people who have no clue join PF parties that REQUIRE that you be experienced. These people try to sneak in all the time. You've seen them. Drowning in Leviathan, killing the BLM in Mog EX without denting the other moogles, getting hit by every Weight and Landslide in Titan EX... Weekly clear party? Must be experienced!? TIME TO SNEAK IN AND HOPE FOR A CARRY.

Or maybe go back to DF, or only join learning PTs. If you think "elitists" are bad for the game, imagine how those "elitists" feel about all the scrubs who sneak into "experienced only" parties and play like they bought their account all of 10 minutes ago.