You can blame for your teammates for that. That looks like a regular shoutcalling since you see the monk, reaper, ninja attack at the top being singular, the red mage is a little longer at 6x and monk which is normally because they dive the backline and people don't peel for shhh in most elo's. Considering the person spam pinging is the WHM in the group, I'd have to assume they were a high priority target and would be spam pinging because people weren't listening because that's what I do. There's nothing else you can do besides spam ping to either do 1 or 2 things: 1. get their attention so they listen or 2. annoy the hell out of them like they are to you because they're ignoring calls without giving their own. I've had 5-6+ pings of Retreat and Regroup in chat before because it'll be like:
Fall back and regroup!
*still running forward into a 1v5 situation*
Fall back and regroup!
*still running forward into a 1v5 situation*
Fall back and regroup!
*dies and makes the next fight a 4v5*
Fall back and regroup!
Hello!
Fall back and regroup!
Fall back and regroup!
*sees another person running by themselves*
Hello!
Everyone, group up!
Fall back and regroup!
Hello!
DRG: 100% LB!

Like if people weren't brain dead and listened to the call they wouldn't be spammed besides people who have it macro'd which is few from what I've seen. Otherwise it'd be switching targets to indicate who the next highest priority and wouldn't be spam since it's not the same message.