![1boy 1girl alternate_color black_legwear bowsette bowsette_jr. breasts breathing_fire cleavage collar commentary crown crying crying_with_eyes_open eyebrows eyebrows_visible_through_hair fire forked_eyebrows gradient_hair green_eyes highres horns large_breasts mario_(series) multicolored_hair new_super_mario_bros._u_deluxe personification pointy_ears ponytail red_eyes red_hair sharp_teeth shell sneer spiked_collar spikes super_crown super_mario_sunshine tail tears teeth thighhighs torichamaru translated twitter_username rating:s score:27 post #3263217](/cdn_image/preview/92/fb/92fb2a1c61f5159e708a0e15aaf7e235.jpg)
While just as anger inducing as a smirk, a sneer is a sign of absolute contempt. A sneer sends the message that the person sneering believes the target of their ire is so utterly pathetic that they want to laugh. It's an extreme expression and should be used sparingly.
If it's not a smile, use disdain or disgust instead. If the emotion presented is anger or hate, use scowl instead.