Watford captain Troy Deeney said his team were motivated to fight back from 2-0 down at West Ham because they felt their opponents were embarrassing them.
Dimitri Payet set up Michail Antonio's second goal with a rabona after Manuel Lanzini had tried to score with the same skill.
Odion Ighalo, Deeney, Etienne Capoue and Jose Holebas gave Watford victory.
"As a player I though they were trying to mug us off a little bit," Deeney told BBC Radio 5 live.
"You can appreciate good skill and that was great skill for the second goal but as a professional you cannot allow someone to do that to you.