Am I overreacting or was this a ***** move?

So, my friend drew this dragon and posted it to fb, (yeah.. fb. Where the drama starts). She usually doesn't have anyone commenting on her stuff so I did. Note that I was still kinda displeased with the way she treated me the last few days of school, and I already know she's fair-weathered (only there for you when it's most convenient to her, basically). Getting off track. ANYWAY, I commented o her drawing, I said,"can you train it?" and she goes,"sure thing... it'll just eat you first.." Now, this isn't something she'd write unless she's annoyed w/ you, why she is, idk bcause she never really talks to me on summer break. Every time I text her, she says hi then never responds. SO THEN almost an hour later, she deletes it and REPOSTS the picture saying,"A better pic of my dragon" I blew up. I created a status that didn't say her name but basically says how I hate being nice to someone when they're unpleasant to be around with then said get bent you whore, you know who you are. I honestly don't care if it's not appropriate, I'm sick of keeping what I really feel inside and I'm mad at myself for getting sucked back into the trash called fb. I just wanna be told I'm right, is that so wrong?