I don't know if Twitter take into account the number of times a tweet is reported (it was posted on Saturday), but it's worth a try. We can't let them get away with hate like that. At the very least, they ought to lose their "official blue tick" status, if they are just hate-filled trolls now (it's not as if there's a campaign).
I was looking for how this has been reported elsewhere, and came across this from the Wikipedia page for the referendum:
On 24 June 2016, a Polish school in Cambridgeshire was vandalised with a sign reading "Leave the EU. No more Polish vermin".[306] Following the referendum result, similar signs were distributed outside homes and schools in Huntingdon, with some left on the cars of Polish residents collecting their children from school.[307] The police investigated, but brought no charges and it is not known whether the signs were intended as an attack on the Polish community or to discredit the Brexit vote[citation needed]
https://en.wikipedia.org/wiki/2016_United_Kingdom_European_Union_membership_referendum#Abuse_and_hate_crime_allegations
Why bother 'discrediting the Brexit vote' when the official Leave.EU organisation is saying it openly?