Some might see such dismissals (of "useless" proposals) as a marker of a focus and honesty, and thus give the author of the competing proposal more attention.
I think that dismissals may improve one's standing within an 'in-group', at the cost of further hardening the opposition (by an 'out-group'). I generally see dismissals as indicators of arrogance, and signs that the author may not have thought through all the implications of their proposal.
If we could separate their entanglements, we would find that the cost of this or that sort of energy is nothing compared to the cost of systematically despising out-groupers.
