Stock Basher
  
Haters gonna hate. In this case...they're gonna hate stocks. See: Short Seller.
A stock basher is a naysayer who just can’t accept that shares of whatever.com are trading at $187, 100x earnings, or some logic-defying valuation…or with lawsuit or fraud toxicity that would otherwise mean that the stock “should” be trading a lot lower.
So they bash. They whine about the price. They publish in blogs or big mass emails. Or other ways of denigrating the shares which the basher (rhymes with party-crasher) thinks should be more like $30 a share. Or worse.