I can see where the frustration comes from, but I don't think a rule prohibiting people from even doing it is fair. The taunt itself is very easy to avoid, so if the hale walks into it, then he should get punished by the reds for doing so.. or at least that's how I'm thinking of this. It's pretty tough to pull off a taunt trap the way it is, and if the sniper can consistently hit the huntsman taunt on you then he should definitely be rewarded.
-1 for the reasons stated above