Actually taunts can be very useful depending on the fighter. Especially if the fighter's signature ability works better with a taunt than without one.
Scarlet Viper benefits greatly from equipping the Scarlet Ladies taunt, which grants her regen to remove the bleed she applies on herself.
Number One works well with equipping Aroo Ready? Taunt because it grants 1 hype and the haste necessary for him to gain Enrage on hit.
Armed Forces is better off with Medici Muscle to gain armor and tank blockbuster attacks, in addition to her defensive SA that can grant armor and unflinching. Similarly, Resonant Evil is better off with using Bagpipe Blues.