"pop" is deemed to mean more than popular to record copanies, they see it as an actual type of music, a particular sound. A money-making sound. Don't confuse yourself thinking you dont like "pop" music though.
(*please note if she referred to herself as an artist in my presence i would donkey punch her)
"Hi Im Jake Teblaauznikov, I am an overweight 30 year old Russian man. I make music inspired by Britney Spears, basically exactly the same to her music, but noones heard of me and noone buys my record, I am not a pop artist"
Spice Girls got popular, bickered among each other, sang on their own, then pow!
Britney Spears got popular, then pow! Shes a porno star among cyber-wienies!
This is the cycle of pop music. Don't be a pop artist, they'll love you, then they'll hate you.