hey i figured it out!

in ublock settings go to "my filters"

there, for every username you add a new line with the following: 1337x.to##tr:has-text(USERNAME)

this removes any tablerow (html tr element) that contains the string USERNAME, so for you it would look like this:

again, if you want to block another user, add a new line and replace USERNAME with the actual username you want to block

i dont know if this is great "coding" performance wise since it has to check quite some nodes but the site loads pretty quick for me

have fun :)