Yes, smirking would be incredibly discouraging. Applejack didn't like how Kudamon was grinning at her, and she certainly wouldn't tolerate it from Trixie.

"Common ground?" she repeated, blinking large green eyes. She turned her head towards the little beast once more. "Well, she says she's a holy Digimon, whatever that means. An' she's able to do fancy calculations. Sometimes Ah can barely understand a word she's talkin' about!"