I agree that you argue like a 10 year old kid.
And you should have put a comma there, unless you're British. As delicate as you are, you might be.
Commas with More Than Two List Items
If there are more than two list items, those following US convention should use a comma before the conjunction (usually "and" or "or").
- Please buy bread, milk, and cheese ()
Those following UK convention should not use a comma.
- Please buy bread, milk and cheese ()
Be aware that many in the UK use a comma, which is called a serial comma or an
Oxford Comma. If your organization uses the Oxford Comma, you should too. Whatever convention you use, be consistent.