Delta First Class Bathroom Available for Main Cabin Passengers?

My rant of the day is the usage of bathrooms on planes. I was traveling to Las Vegas in Delta's Comfort Plus Section and I had to use the bathroom. The closest one was in First Class. As I was on my way to the bathroom, a flight attendant asked me what seat I was in and when I told her, she ordered me to use the bathroom at the back of the plane in the coach section. As I went back, I noticed that she then closed the curtain to the first class section. The flight attendant's action irritated me as I walked back to the bathroom and then had to wait for 10 minutes until one freed up.

It did make me question whether Delta restricted its first class bathroom to only first class passengers. Also, if that is the case, why doesn't Comfort Plus have its own set up bathrooms? It is a premier cabin where you pay more for some unspecified reason.

I tried to research this. I did not find anything on Delta's website but some other websites state that Delta's policy for using the bathrooms on their planes is that customers should use the bathroom in the cabin they are in, but the crew can make special accommodations if needed. Here are some other things to keep in mind when using the bathroom on a Delta flight:

• Queuing: Delta flight attendants are trained to differentiate between queuing and congregating. If the line gets too long or there's a safety concern, flight attendants may ask passengers to return to their seats.
• Safety: The safest course of action is to follow the crew's instructions.
• Children: If you're traveling with young children, you can take them to the bathroom when the seat belt sign is off. If they need to go while the seat belt sign is on, you should apologize to the crew and be as quick as possible

How I read this is that it is not a prohibition to use the first class bathroom when seated in coach or comfort plus but rather a suggestion. I just wonder about the customer service approach that this flight attendant provided. She seemed to demean me for attempting to use a bathroom outside of my cabin. The learning from this policy is bathroom usage is not a hard and fast rule, just a guideline. Be a little nicer!!

Is Delta's policy was consistent with other airlines? Most of the other airlines have this same vague language which suggests that you should use the bathroom in your cabin. But in no policy or rule does it say that going outside of your cabin is prohibited. I wonder how many flight attendants get a kick out of the power trip of kicking passengers out of the first class bathrooms? With all of this travel rage, you would think that flight attendants would not add to the difficulty of travel. But I could be wrong.

What do you think is the right approach?