"Everyone you know is practically drowning in suffering"
SH brings up this point to contextualize our own suffering. It's hard for us to socialize with others and make connections, but if we consider other peoples' plights and struggles, it gives us more perspective and may aid us to talk, converse, and collaborate with them.
I tried to apply this in driving. If I am honked at, I usually feel it's not justified and it slightly harms my mood. Therefore, when I see other drivers doing something unsafe or unskillful, I try to spare the horn and simply slow down myself. This is likely another suffering, late person with back pain, bills weighing on them, possibly phone addiction or something urgent going on, and the least I can do is slow down and give them space.
Looking around us and appreciating the suffering of others is a very useful exercise.