I don't know how familiar you are with the twitter etiquette and having some manners & boundaries there, esp. when it comes to yapping about celebs/skaters/etc... But you know the irritating thing where some random person A tweets some silly/embarrassing/harsh/whatever stuff about some well known person X while using X's
actual twitter handle, thinking that somehow X won't come across those tweets (maybe because A has never bothered to think about how twitter and its algorithms work?) and then A is surprised and SHOCKED if/when X actually the sees those stupid tweets and talks back? Or even if A is considerate enough not to straight up @ at X, A still might use X's name in a conjunction with a hashtag or some keywords/keyphrase that might bring it to X's attention (see e.g.
this exchange and the whole "I didn't think anyone would read it" thing)?
Well, using a spelling like this is kinda the opposite. Not only do you avoid using X's twitter handle, you also deliberately "ruin" the searchability of X's name by inserting a character such as / in the middle it. This ensures that when the unsuspecting person X logs onto twitter, they don't have to come across those silly little tweets you made about them but didn't want them to see (unless some person B comes in and retweets that silly stuff @ person X for sh!/s and giggles, but that's another story)