Boyfriend is dismissive of sweet talk/texts

Everytime I say something sweet to my boyfriend, such as a text telling him of a song that reminds me of him, implying that I'm thinking about him or stuff like "you made my day great" he always has a snarky remark.For example, he's visiting family at the moment and I haven't seen him in almost a month. I sent him a text saying "They're playing your favorite song at this McDonald's. Throwback to our car rides :)" and he responded with "You're eating McDonald's?! Healthy!!!"Am I being highly sensitive here?