I almost agree. I think it's not
information and context that's being packed, it's
emotional load.
As any writer or poet knows, words are handles to emotions. Choose a slightly different word, and your readers will tend to feel very differently after reading a line containing, otherwise, the same information. It's a wetware equivalent of RPC API.
Memes are this, but taken up to 11. They transmit a much more complex and powerful emotional payload, in readily digestible form.
Like in this case, I could write a whole paragraph listing the kind of emotions that little GIF communicated. Calm distancing, depreciation, disrespect, feeling safe, ... Written out as words, it wouldn't fit in a Tweet, and wouldn't be as powerful a message.