A scouser is anyone from Liverpool.
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Of course scouser is used , usually by the ignorant and bigoted as some kind of negative, classing a heterogeneous population on a negative found everywhere.
Peoples use of the word is usually a good indicator of the character of the person using it , rather than the subject themselves.
I give Richs posts 1807 followed by 1809 to give the negative form of the word its usual context.
The scouse jokes were funny once, probably first time they were told - in 1972.