the 150 abusive tweets claim came from an impartial study on the phenomenon of abuse on twitter, specificslly with reference to the McCann hashtag. If you wish to dispute the claims made by those learned individuals it is incumbent on you to provide a rebuttal to their claims, or accept it as fact. Your choice.
I have no need whatsoever to accept this claim, nor to rebut it, as I am sure you are aware.
What has been published on-line about the actual study does not AFAIK claim 150 as a daily total, nor does it define how it classifies tweets as 'vile'. I can't remember if it even uses the word 'vile'.
The '150 vile tweets a day' from memory, originates from The Sun, a newspaper not known for factual, accurate reporting.
Consequently, if YOU wish to claim '150 vile tweets a day' as an established fact straight from the scientists' report, it is up to YOU to provide evidence of YOUR assertion. Presumably you have the word they actually used, which would equate to 'vile', and the methodology used, which would be enlightening. Oh, and the total number of tweets/day used the hashtag they were examining. The devil is in the detail.