Boyfriend called me a big baby?

I've been with my boyfriend for just over a year. I've rarely cried in front of him (we've had a pretty happy relationship) however, whenever we argue or have an issue and I cry he tells me I'm being a "big baby." This has happened almost every time I've cried after a fight.

Since when does having human emotion a bad thing? I sometimes cry after arguments because I hate arguing and negativity. Apparently I'm just being a big baby.

What do you think?