The campaign, launched this week, includes a video highlighting the impact of hate crime on individuals.
The campaign is a reaction to figures released by the Home Office that found a 41 per cent rise in hate crime following the EU Referendum.
It was launched with the backing of the Conservatives, Labour and the Liberal Democrats and around 20 groups representing ethnic minorities, faith associations and campaigners. Boxer Carl Froch MBE and footballer Jermaine Defoe also gave their support.
May said: "Hate crime has absolutely no place in Britain and I’m delighted to see people and groups from all communities coming together to support the #BetterThanThat campaign.
"As long as hate crime exists, we must challenge ourselves to do more and this campaign builds on the vital work Government is already doing through the Hate Crime Action plan and I wish #BetterThanThat every success."