Sneer (verb)

1. To show disdain, contempt, or ridicule by twisting one's features into a disdainful or contemptuous expression.
2. To make a sarcastic or disdainful remark.

Origin:

From middle english sneeren, from old norse snjara.

Examples:

1. He sneered at her comment, clearly finding it stupid and pointless.
2. She sneered at his ignorance, shaking her head in disbelief.
3. The young man sneered at the older man's suit, thinking he looked silly and outdated.
4. She sneered at the waiter's suggestion, telling him she knew exactly what she wanted.
5. The boss sneered at the employee's suggestion, telling her it was impossible and unrealistic.