'It could be worse op, he could have said you were nearly as good a mum as his mum'. Ha! Now that would awaken the rage in me, Joyce
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OP, I do think that you are being a a bit unreasonable. Also silly and irrational. However, you are human, and I think we all (as humans, not women) have unreasonable, silly and irrational moments. For example, after I had my first MC, DP and I decided it would have been a boy. We had no reason for thinking this, as I was nowhere near pregnant enough to find out the sex. But, it helped us, so we decided it was a boy and picked a name. A year later, DP's sister had a boy, and used 'our' name (which was a very popular name, think 'Jack' or similar, so we should have expected lots of people we knew to use it). She didn't do it to hurt us, but I was irrationally angry with her for ages, as it felt like she had taken our name (and in a mad way, our baby). Irrational, silly, and unreasonable, yes. Similarly, your DH did not post what he did to hurt you. You feel hurt by it, but I doubt that that was his intention.
So, feel upset for a wee while, be a bit cross, then shake it off, get past it, and move on. I do not mean that in a cruel way, it is exactly what we had to do. And remember, he was excited for his friend who has just had a baby. This is a good thing, right?