Originally Posted by
SFflyer123
If this bag does not fit the United regulations, she may have a point; you may have to check it in because it's simply too big and should not be there. However, if it meets regulations, and you got on first, she should be the one who needs to gate-check her items, not you. That's part of the deal that United gives you in exchange for your loytalty of flying 50,000 miles per year.
Many (including my legal sized carry-on) do not fit lengthwise on Airbus's but fit just fine on Boeing's. One of the many annoying things to me about buying from the Euro's!

I agree it is a waste of time to contact UA about the passenger unless you know they are employees for certain and/or they had crew tags on your bag. I would actually assume they were not because the FA helped you and not her which is the opposite of what would normally happen as they look out for each other. A letter of compliment for the FA that helped you would be great and I would have given him/her an GTEM certificate. It is infuriating when people reposition bags. I will get up and reposition it back. Just be glad you were in Row 1 of a CRJ!!

I personally have given up on the standard roller-boards and moved to a small duffle and have had many fewer issues since!