We had several people give us clothing and items when both of our kids were born. We were able to use some and had to forgo others either because of size differences, etc.
Though I'd state it a little differently than the previous mom, I do think part of the giving process is understanding that not everyone may share the same tastes. Also, new parents may be more likely to desire getting their kids new things. My sister took every hand me down she could get, but she also got weekly Gymboree items from her mother-in-law.
We tend to buy our own clothes though we've accepted many hand-me-downs, too.
We can't tell you not to be hurt and insulted - reactions are hard to control. Perhaps next time, try not to set-up the expectation that everyone will admire the items as much as you and feel good that you're able to pass along something that you hope they'll enjoy