Why Would She Say That?

I sent my ex a very simple “happy new year, always wishing you the best” on new years and she never responded (mass text). I was trying to be friendly and reach out to her (mind you she was the one who screwed me over when we were in a relationship). I saw absolutely no harm in sending the text and by doing so letting her know that I was over everything and ready to be friends. I actually CAN see myself being friends with her and not anything more. She didn’t respond and so I was fine with that. Now, almost a month later, I stumbled upon her twitter and one of her past tweets that said something around the lines of ” my ex thinks the holidays means it’s time to be friends #delete #stalking”. I read it and was just kind of baffled. I was just trying to be nice (never doing that again). Additionally, I live across the freaking country (stalking what?) What could be her problem?
I was truly trying to be a better and bigger person by extending a hand of friendship (she was after all a very important person to me at one point in time). I see no reason as to why she would blast such an angry tweet in response to my kind text (especially since I never did anything wrong during the course of our rather short relationship). I’m not going to lie- reading the tweet did bother me.Why would anyone do that?