While there may possibly be a small amount of casuals left, it is most likely there will be a large influx both come the next patch, as well as when the PS4 version is released. Nonetheless such bullying isn't limited to casuals, and seems that it can happen to anybody who isn't fully geared, or isn't running so efficiently.
Also "you should be flamed for not doing your job". No. The player may be doing their job to the extent known to them, we should help them, if only moderately, to actually "do their job" to modern consensus, not bash them for it; otherwise we may damage the userbase. Since you reference Xi, then what of the people who have never run Abbysea? Just flame them for not knowing how to proc? Monotony is not an excuse to be uncivil to others either.