In online gaming a scrublord will tend to create their own "moral rules" by which they believe others should play. They will generally make judgement calls about other peoples sanity, mental health, life chances, family history and social connectedness based purely on how closely they adhere to these moral rules.
These rules are often formed under the guise of "honour" or "fair play". They also may include statements such as "I only play for fun" or "I don't care, it's just a game".
Mr Doodles: Hey there kiddo, want to have a honourable one versus one duel to see whom out of us in the finer gentleman?
Scrublord: Why yes, yes I do. May our duel be honourable!
100 of Mr Doodles friends jump out and tear the shit out of the Scrublord
Scrublord: WTF THIS IS NOT FAIR YOU HAVE NO HONOUR YOU MUST BE A 8 YEAR OLD KID WITH NO FRIENDS AND YOUR PARENTS HATE YOU THIS IS JUST A GAME I DON'T EVEN CARE AND I'M NOT EVEN CRYING IRL RIGHT NOW, HONESTLY, I'M NOT.