I think it stems from fact that for some a SR means x-large pulls, aoe, no side rooms, and tanking to the seal just before boss fights (that's what I enjoy and what I mean by speed run), and for others it means sleeping and sneaking.

Small rant :

Last week, PuG through roulette (I'm BLM), landed in WP, agreed to do a SR. After the 2nd pull, I had a tank berate me for using aoe. S/he wanted me to sleep the trash and just burn the tonberries, which frankly, when you have more than 1 tonberry takes an equivalent amount of time since you can only use fire 1 & 3, but no flare. Turns out the reason was because s/he couldn't hold aggro from multiple mobs for the life of him/her - I guess s/he just never figured out how to do it -the healer must have died 3-4 times because the tank would either simply not pick up or lose a mob (which is completely normal and forgivable), and not notice (that however is bad) as the healer would be trying to keep him/herself alive and spamming cure, hence pulling more mobs off the tank, until they both died within seconds, and of course since I humored the tank at first, all the trash was up and they had trouble making it back to us. It was a mess. Healer was so-so but more than adequate for WP, tank was ilvl70-90 with relic but an utter mess - s/he used up the lb on the 1st boss and I had to explain that lb should be left for the DPS during boss fights, and later would run to the valve mechanism and try repeatedly to activate it when the oil was lying on the ground in that very room. Other DPS & I OTed the rest of the run to keep aggro off the healer. I still wonder if we were being trolled but the tank was courteous at first and then as I explained aggro, oil & lb use, became downright offensive by the end, so I'm leaning towards embarrassment-driven anger brought on by simple ineptitude. When I thanked the other DPS at the end of the run, the tank threw a hissy fit about how the other DPS 'sucked' and I shouldn't be thanking him.

For the record, on hundreds of runs, I can count the times I've had an offensive party member (tank or other) on one hand, so it's definitely the exception, not the rule.

Conversely, 30 minutes before maintenance the other day, roulette-ed into Haukke HM and blew through it with 8 minutes to spare with everyone on point even though we were a PuG and I (in Asia) and another member (in Australia) were lagging, sometimes badly - it was kind of epic because we were against the clock and we knew that 1 wipe could mean losing the entire run!