Was this a good reaction?

Eariler today I was watching the steve wilkos show and I was telling my grandmother about the episode and how I thought it was wrong for a mother to lie about child abuse accusations against a man she is mad at. I feel that it’s wrong for a parent to use a child because they are mad at their spouce. She then told me how everyone lie then she said that I tell “Whoppers all the time” and that I was a liar, this really hurt my feelings. I have already been going through a hard time and this sent me over the edge and made me want to cry. But I didn’t want her to see me cry so I went out on a walk, went into a porta potty and let myself cry. I cleaned off my face afterwards and went on a walk, I came home and didn’t say a word to her about how her comment hurt my feelings. Did I do the right thing by saying nothing?