my son(6yr) and i were playing with clay, he was fustrated that his creation was coming apart, he was getting another peice out of a bowl and doing so aggresivly the bowl smashed on the ground. i remained calm while he got upset.. my SO comes in angry holding our baby.. i ask son to clean up..my SO called my son(his step son) a fucking idiot and said stop whining i told him i was handilng it, not to call names and yell. he got angry at me saying i don't spend enough time with the kids (id been playing with them for hours),my son was my favorite. he stomped around the house, called me a zombie for not getting mad, after i asked him why my son getting upset caused him to be angry... stuff like this always happening..is this normal? have i become desensitised to his behaviour? sorry my spellings a bit off! need some advice feedback please!