West Australian opposition leader Liza Harvey has trotted out a "tired, lazy argument" in defending her party not starting its annual state conference with a welcome to country, Aboriginal Affairs Minister Ben Wyatt says.

Liza Harvey at the 2019 WA Liberal Party Conference. Credit:Nathan Hondros

Asked if it was a good look for the WA Liberal gathering on Saturday to omit the indigenous ceremony, Ms Harvey replied: "It is what it is".

"I think the worst thing you can do is for the sake of political correctness, engage in welcome to countries that aren't meaningful," Ms Harvey told reporters on Sunday.

However it was "entirely appropriate" Prime Minister Scott Morrison acknowledged traditional owners.