nah man It's not like we can do anything really against it without excluding newer members
Stuff like this happens all the time, just go to tempmail and signup on imgflip, 2 captchas, easy 1 minute process and now you can comment anything you want, including racial slurs.
Even this account is a throwaway, realistically, unless Imgflip finds a workaround people like this will stay and can't be removed. Just deleting one won't work until they get tired.
Without a proper failsafe like Zoom's selected .edu domain only or Google meet's site allowing only certain people in all someone needs to do is make a random post online asking people to mass raid this site. It's easy to setup a bot to keep pressing submit or make memes and then change the title to some nazi bullshit or whatever.