Hi
@Sweettibbz
I didn’t experience this first hand as my dad always went for my daughter (he would have been mortified if he’d been himself) but it was horrible to see. I used to tell dad off and keep my daughter away from him and eventually it passed.
Is there anyone who could do this for you? If not I suggest telling your LO that such language is not acceptable and walk away. If she has any awareness it may stop the behaviour - it did with dad - although he’d never admit he was wrong he behaved better when we saw him again.
I’m not surprised you’re feeling down. I used to come and rant on here when things got too much for me. It helped.