Earlier quoted context omitted.
I'd just like this trend of sending reaction gifs to end. People keep posting them in Slack all the time, but I find it about as appropriate as that brief time when all my uni teachers decided that it's hip to include rage comic faces into every other slide of every presentation. , yes I know, I'm fun at parties…
Have you ever been in a mostly white office and noticed how many reaction GIFs are of black people? The term to Google here is “digital blackface”. If you bring this to more people’s attention my guess is that reaction GIFs will become less prevalent in your office.
I don't think there's any solid evidence of disproportional use of of one ethnic group by another. You can certainly find individuals who thoughtlessly or deliberately do that but generalizing that to some random population (eg of office workers) is likely wrong.