I haven't seen it being harassed, but who knows. I see the other 3 gouramis chasing each other occasionally . This particular gourami has been staying in the mid-to-bottom part of the tank mostly. I have seen that whatever food it can get is the food that drifts close enough to it.
I say that because if you have more than one male, one may be dominated by the other. If it is a female, she can be stressed by the continual pursuit from one or more males. Dwarf gouramis are peaceful towards other species but males can be agressive toward their own. Males are territorial and will chase each other. Males courship females, sometimes agressively. Those 2 comportments, in a tank, may lead to harassment cases. I have seen it often.