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This was the inspiration for my Aarakocra having a Bostonian accent
(startrek.website)
People from Boston would hate me.
I apologize for nothing.
And rule 0 of DnD is that the DM has final say.
So if the DM of your group agrees with the assertion that a lot of other birds that can speak can make those sounds so they should be able to as well, then that's the way it is at the table.
Remember the goal is to have fun, and sometimes some things will get bent a bit to have more fun. And if it's a flavor thing (like the bird people unable to say certain sounds) then I'm more inclined to change it for the table.
It was just an attempt at absurdity, but you silly boys are looking for a fight I guess.
From an outside perspective, your "but do go on" remark was the first comment that seemed to be looking for a fight.
But do go on.