Was I undermined

Came home with toddler (3year old) and his dad was watching something on tv. Toddler says to dad I want to watch my dog show. Before dad can answer I say to toddler, no daddy is watching something right now you can go play with your toys. (The reason I did this is because dad usually has a hissy fit over not being able to watch his tv when child is around as child will demand to watch and dad ends up always giving in screaming and shouting while letting child get what they want and then sulking about it). Anyway after I gave toddler my answer he goes back over to dad and ask him again. So I repeat and say no I’ve already told you daddy is watching his show right now so you can go and play. As I leave the room I hear child ask dad again. Dad huffs and puffs and says in a rude tone fine here watch what you want! Dad proceeds to put child show on for child.

I’m now fuming as I feel dad has completely undermined me as a parent in front of child. I ask dad why he did that he says cos he can’t be arsed to sit there listening to him asking him a hundred times so he can just watch it. I stated with that attitude we will end up with a spoilt brat and giving in for an easy life isn’t how you should parent. Ended in a row with me now questioning whether I’m in the wrong (he is amazing at gaslighting and manipulating, so much so I always end up questioning whether I’m wrong)

Insight anyone?

I am mature enough to reflect on myself and on my own words and actions and in hindsight could probably of prevented this if I hadn’t answered child first and just left dad to answer/deal with first!!! However I didn’t but that should give dad the right to undermine me?