Should I go?

Brittney • Baby 👶 girl born April 30th💕 ✨

So my BFs friend lives with my BFs mom.. and his mom trashed talked me, trashed talked my dad.. all to my face. And told my bf to leave me. All over winning $50k in lottery a few months ago. And now it’s my BFs friends birthday. And he wants me to go and sit and eat cake with his mom.. whole family (who also trash talked me and my dad) should I go? I feel like if we go, we are just letting her know that it’s okay to trash talk me.