I'm a sr. software engineer and you best believe I spam furry emotes at my coworkers. In my experience and in the companies I've worked at, most people who are even moderately talented operate with a relaxed attitude. As long as they get their deliverables done, don't worry about how they do it. If you've got a problem with them they'll take another offer in a week.
Edit: Also, I'd like to note that I think this behavior is healthy. People should be allowed to be themselves at work. I often joke about people putting on their "corporatesonas" at work.
This is always how I’ve managed a team. If someone is asleep at the desk, rollerblading on the roof, but gets all their work done, I’m happy. If someone just looks busy all the time and is dressed nice, but constantly causes issues I’m a hot little potato.