I was completely sold when I think it's in the first episode Mark is walking past some lads who accuse him of being a "paedo" and he hurries off thinking to him

I was completely sold when I think it's in the first episode Mark is walking past some lads who accuse him of being a "paedo" and he hurries off thinking to himself "You're not a paedo. You're definitely not a paedo." as they've finally said something bad that doesn't apply to him.