Bitchy?

I was on skype with my boyfriend and I went to the kitchen and started making coffee like usual. I saw the creamer out and went to my dad to say, "Hey, the creamer was left out. You need to make sure you guys put it back when you're done or it'll go bad." 
To which my boyfriend responded in my headphones, "that was pretty bitchy, wow." He continued to explain by saying, "maybe that's why they're so quick to be mean to you."
I know I'm not the best at talking with my parents, but I didn't think something so calm and normal could be labeled "bitchy." 
What do I even say? Was I saying something wrong? I actually feel horrible, not just about my parents, but just knowing my boyfriend has this impression of how I talk to my parents.