We just went through a phase like this and it was awful!
Like you, at first I was thinking it wasn't too bad but then as it carried on, my feelings were really getting hurt. It was to the point that I was sure DS hated me - a screaming fit in Rona where he was slapping my hands to keep ME from pushing the cart and yelling "NO! NO! Dada!!" had me in tears! It was even at night where if DS woke up and I went in he would scream and cry and call for "Dada".
Like you, I tend to be the "tough guy" and I'm also the one who drops him off at daycare in the mornings (DH gets to be the fun guy who picks him up). I kept trying to rationalize that maybe that's why it was happening. I was also worried that he could somehow sense that his world is about to change with the new baby on the way and was blaming me for being pregnant (I know, I know, d@mn
pregnancy hormones! *L*)
It went on for about a good week and then just stopped. He still loves his Dada and wants to be with him but I'm back in the good books and he still wants me again too! I was so frustrated when people kept telling me it was a phase but it really was and it did pass. Hang in there!