1) Contemptuous one 2) Derisive sort 3) Disagreeable person 4) Harsh critic 5) Internet troll, essentially 6) One delivering raspberries 7) One who shows contempt 8) Pooh-pooher 9) Sneerer 10) Unpleasant person 1) Ridiculer 2) Sneerer 
• (n.) One who scorns; a despiser; a contemner; specifically, a scoffer at religion.
Scorn'er noun One who scorns; a despiser; a contemner; specifically, a scoffer at religion. 'Great scorners of death.' Spenser. « Surely he scorneth the scorners : but he giveth grace unto the lowly.» Prov. iii. 34.