Astralis considers them rivals. Rivalry's can be one sided.
It's clearly a rivalry. It's not like Liquid hasn't beaten them on stage on multiple occasions. It is one sided though no doubt. Of course Liquid versus the field is also pretty one sided over the last two years.
That little factoid of Liquid tearing through pretty much everyone else is as far as I'm concerned a testament to how great Astralis actually is.