An (seemingly) online poll finding that the candidate who draws an overwhelming amount more support from online corners than the opposition is less obnoxious than others is...well, not surprising.
With that being said: I have been unfortunate enough as of late to veer off into some of these "Clinton corners" on the web (that I really didn't think existed in any reasonable quantity) and I will say that Clinton supporters are far more likely to poke Sanders with actual personal attacks and physical critiques than the other way around.
What place did you stumble upon? I doubt anything could match the vitriol directed towards Hillary and her supporters on Reddit.