Willie Monroe Jr. is fighting Englishman Billy Joe Saunders for the WBO Middleweight title in London tomorrow.

Things got weird during the weigh-in when Monroe reached over and tussled Saunders' son's hair. The tyke responded by hitting Monroe below the belt.

Monroe was not happy after taking the blow to the nuts.

I honestly thought people in London were cool but I've called a Nigger..a wanker...a Latin Fuck etc and now at the weigh ins They bring a kid on stage to punch me in the Nuts and nothing was done about it @frank_warren_official should be ashamed of himself #williemonroejr #SaundersMonroe #MonroeSaunders #Wewin. #badkids #coffinseason #andthenew #weighins

A post shared by Willie Monroe Jr (@willie_elmongoose_monroejr) on Sep 15, 2017 at 6:47am PDT

However, Saunders defended his son's pugnacious behavior.

My sons been taught when A stranger puts their hands on them they don't know punch and run away self defence @boxnationtv @frankwarren_tv

— billyjoesaunders (@bjsaunders_) September 15, 2017

What do you think? Was the low blow uncalled for?