Probably not in that condescending way, but it is useful to keep in mind that people are fundamentally different from you. The trouble is when you think they are inferior beings (their tech skills on the other hand are inferior, no reason to not state that plainly).
For what it is worth I have coded Erlang at work and am quite partial to cat pictures, myself.
Well, let's talk about the reality now. By definition, most people are mediocre, not very smart, not very healthy, not very pretty, etc. Most! That's whom Slack targets - most.
I was joking. Sometimes emojis help as we're missing a whole communication channel in here (body language).