This appeal to the morality of empathy is actually not relevant to either the discussion or your comment.
>This kind of empathy with others will make you much more effective when you're creating for people who are not like you.
What you are describing is the action of gaining knowledge of other's likes/dislikes. This can be done entirely robotically i.e. completely without emotion. Knowing about others is only a part of empathy. The other part is actually exercising this emotion in your actions, choices, and interactions with other people.
I don't think not understanding snapchat (and not wanting to understand snapchat) is a display of a lack of empathy. There are many things that each of us choose not to spend time learning about. That is just a basic facet of life.
And, I find it extremely disingenuous to start blaming people of being "bad human beings" because they do not care to entertain themselves with a currently popular social application. Like really? Is this what we have lowered our discussion standards too?
This jump to appealing to some sort of moral high-ground to establish your point is logically fallacious at best. Especially when morality/ethics plays zero part in people's personal views/choices in regards to a topic e.g. this topic.
>make an effort to talk to people outside of your normal social circles once in a while.
You do realize that the majority of Snapchat's users are most likely using it to participate in THEIR social circles, right? To each their own. It's perfectly fine to NOT be in some social circles.
I am seriously amused that the top comment is an appeal to ethical standards in regards to people's personal opinions about an app. Very amused! :D