Am I a Jerk or is this a fair move?

[artichoker]

out of position one player ahead of me. i am about to raise on the turn have half pot size chips (considerable amount) in my hand cross the line in the air and have not yet put my chips down. mind you im not trying to get a reaction, moving slowly, or not purposefully trying to angle this play at all. player in position says all in and tosses chips pat the line on the table. it was the quickest move ive ever seen by anyone. so without touching the felt i took my chips back and mucked my hand.