People who blather on about how much education they have and / or how long they have been doing something.
Blowing their own horn.
It's pretty childish.
And not very effective in an argument.
You can do better, bobette.
Try again.
We're not picking on your Wonder Boy over minor issues.
He sold you a bill of goods.
Now he's finding underhanded ways to screw you over.
Face reality.
Stop making excuses for him.